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Proguard Errors When Creating a Signed APK

I have minifyEnabled set to true in my build.gradle file. I get a lot of errors when creating a signed APK for my application:

Warning:com.dropbox.core.http.OkHttp3Requestor$AsyncCallback: can't find superclass or interface okhttp3.Callback Warning:com.dropbox.core.http.OkHttp3Requestor$PipedRequestBody: can't find superclass or interface okhttp3.RequestBody Warning:com.dropbox.core.http.OkHttpRequestor$AsyncCallback: can't find superclass or interface com.squareup.okhttp.Callback Warning:com.dropbox.core.http.OkHttpRequestor$PipedRequestBody: can't find superclass or interface com.squareup.okhttp.RequestBody Warning:com.dropbox.core.DbxStandardSessionStore: can't find referenced class javax.servlet.http.HttpSession Warning:com.dropbox.core.http.GoogleAppEngineRequestor: can't find referenced class com.google.appengine.api.urlfetch.URLFetchServiceFactory Warning:com.dropbox.core.http.GoogleAppEngineRequestor: can't find referenced class com.google.appengine.api.urlfetch.HTTPMethod Warning:com.dropbox.core.http.GoogleAppEngineRequestor: can't find referenced class com.google.appengine.api.urlfetch.URLFetchService Warning:com.dropbox.core.http.GoogleAppEngineRequestor: can't find referenced class com.google.appengine.api.urlfetch.HTTPMethod Warning:com.dropbox.core.http.GoogleAppEngineRequestor: can't find referenced class com.google.appengine.api.urlfetch.HTTPRequest Warning:com.dropbox.core.http.GoogleAppEngineRequestor: can't find referenced class com.google.appengine.api.urlfetch.HTTPHeader Warning:com.dropbox.core.http.GoogleAppEngineRequestor: can't find referenced class com.google.appengine.api.urlfetch.HTTPRequest Warning:com.dropbox.core.http.GoogleAppEngineRequestor: can't find referenced class com.google.appengine.api.urlfetch.FetchOptions$Builder Warning:com.dropbox.core.http.GoogleAppEngineRequestor: can't find referenced class com.google.appengine.api.urlfetch.FetchOptions Warning:com.dropbox.core.http.GoogleAppEngineRequestor: can't find referenced class com.google.appengine.api.urlfetch.HTTPResponse Warning:com.dropbox.core.http.GoogleAppEngineRequestor: can't find referenced class com.google.appengine.api.urlfetch.HTTPHeader Warning:com.dropbox.core.http.GoogleAppEngineRequestor: can't find referenced class com.google.appengine.api.urlfetch.HTTPResponse Warning:com.dropbox.core.http.GoogleAppEngineRequestor: can't find referenced class com.google.appengine.api.urlfetch.FetchOptions Warning:com.dropbox.core.http.GoogleAppEngineRequestor: can't find referenced class com.google.appengine.api.urlfetch.URLFetchService Warning:com.dropbox.core.http.GoogleAppEngineRequestor: can't find referenced class com.google.appengine.api.urlfetch.HTTPRequest Warning:com.dropbox.core.http.GoogleAppEngineRequestor: can't find referenced class com.google.appengine.api.urlfetch.HTTPHeader Warning:com.dropbox.core.http.GoogleAppEngineRequestor: can't find referenced class com.google.appengine.api.urlfetch.URLFetchServiceFactory Warning:com.dropbox.core.http.GoogleAppEngineRequestor: can't find referenced class com.google.appengine.api.urlfetch.HTTPMethod Warning:com.dropbox.core.http.GoogleAppEngineRequestor: can't find referenced class com.google.appengine.api.urlfetch.URLFetchService Warning:com.dropbox.core.http.GoogleAppEngineRequestor: can't find referenced class com.google.appengine.api.urlfetch.FetchOptions$Builder Warning:com.dropbox.core.http.GoogleAppEngineRequestor: can't find referenced class com.google.appengine.api.urlfetch.FetchOptions Warning:com.dropbox.core.http.GoogleAppEngineRequestor: can't find referenced class com.google.appengine.api.urlfetch.HTTPResponse Warning:com.dropbox.core.http.GoogleAppEngineRequestor: can't find referenced class com.google.appengine.api.urlfetch.URLFetchService Warning:com.dropbox.core.http.GoogleAppEngineRequestor: can't find referenced class com.google.appengine.api.urlfetch.FetchOptions Warning:com.dropbox.core.http.GoogleAppEngineRequestor: can't find referenced class com.google.appengine.api.urlfetch.URLFetchService Warning:com.dropbox.core.http.GoogleAppEngineRequestor: can't find referenced class com.google.appengine.api.urlfetch.FetchOptions Warning:com.dropbox.core.http.GoogleAppEngineRequestor: can't find referenced class com.google.appengine.api.urlfetch.URLFetchService Warning:com.dropbox.core.http.GoogleAppEngineRequestor: can't find referenced class com.google.appengine.api.urlfetch.FetchOptions Warning:com.dropbox.core.http.GoogleAppEngineRequestor: can't find referenced class com.google.appengine.api.urlfetch.URLFetchService Warning:com.dropbox.core.http.GoogleAppEngineRequestor: can't find referenced class com.google.appengine.api.urlfetch.HTTPRequest Warning:com.dropbox.core.http.GoogleAppEngineRequestor: can't find referenced class com.google.appengine.api.urlfetch.HTTPResponse Warning:com.dropbox.core.http.GoogleAppEngineRequestor: can't find referenced class com.google.appengine.api.urlfetch.HTTPRequest Warning:com.dropbox.core.http.GoogleAppEngineRequestor: can't find referenced class com.google.appengine.api.urlfetch.HTTPMethod Warning:com.dropbox.core.http.GoogleAppEngineRequestor: can't find referenced class com.google.appengine.api.urlfetch.HTTPRequest Warning:com.dropbox.core.http.GoogleAppEngineRequestor: can't find referenced class com.google.appengine.api.urlfetch.HTTPMethod Warning:com.dropbox.core.http.GoogleAppEngineRequestor: can't find referenced class com.google.appengine.api.urlfetch.HTTPRequest Warning:com.dropbox.core.http.GoogleAppEngineRequestor: can't find referenced class com.google.appengine.api.urlfetch.HTTPMethod Warning:com.dropbox.core.http.GoogleAppEngineRequestor: can't find referenced class com.google.appengine.api.urlfetch.HTTPRequest Warning:com.dropbox.core.http.GoogleAppEngineRequestor: can't find referenced class com.google.appengine.api.urlfetch.FetchOptions Warning:com.dropbox.core.http.GoogleAppEngineRequestor: can't find referenced class com.google.appengine.api.urlfetch.HTTPResponse Warning:com.dropbox.core.http.GoogleAppEngineRequestor: can't find referenced class com.google.appengine.api.urlfetch.HTTPHeader Warning:com.dropbox.core.http.GoogleAppEngineRequestor: can't find referenced class com.google.appengine.api.urlfetch.HTTPResponse Warning:com.dropbox.core.http.GoogleAppEngineRequestor$FetchServiceUploader: can't find referenced class com.google.appengine.api.urlfetch.HTTPRequest Warning:com.dropbox.core.http.GoogleAppEngineRequestor$FetchServiceUploader: can't find referenced class com.google.appengine.api.urlfetch.URLFetchService Warning:com.dropbox.core.http.GoogleAppEngineRequestor$FetchServiceUploader: can't find referenced class com.google.appengine.api.urlfetch.HTTPRequest Warning:com.dropbox.core.http.GoogleAppEngineRequestor$FetchServiceUploader: can't find referenced class com.google.appengine.api.urlfetch.URLFetchService Warning:com.dropbox.core.http.GoogleAppEngineRequestor$FetchServiceUploader: can't find referenced class com.google.appengine.api.urlfetch.HTTPRequest Warning:com.dropbox.core.http.GoogleAppEngineRequestor$FetchServiceUploader: can't find referenced class com.google.appengine.api.urlfetch.URLFetchService Warning:com.dropbox.core.http.GoogleAppEngineRequestor$FetchServiceUploader: can't find referenced class com.google.appengine.api.urlfetch.HTTPRequest Warning:com.dropbox.core.http.GoogleAppEngineRequestor$FetchServiceUploader: can't find referenced class com.google.appengine.api.urlfetch.URLFetchService Warning:com.dropbox.core.http.GoogleAppEngineRequestor$FetchServiceUploader: can't find referenced class com.google.appengine.api.urlfetch.HTTPRequest Warning:com.dropbox.core.http.GoogleAppEngineRequestor$FetchServiceUploader: can't find referenced class com.google.appengine.api.urlfetch.HTTPResponse Warning:com.dropbox.core.http.OkHttp3Requestor: can't find referenced class okhttp3.OkHttpClient$Builder Warning:com.dropbox.core.http.OkHttp3Requestor: can't find referenced class okhttp3.OkHttpClient Warning:com.dropbox.core.http.OkHttp3Requestor: can't find referenced class okhttp3.Dispatcher Warning:com.dropbox.core.http.OkHttp3Requestor: can't find referenced class okhttp3.Request$Builder Warning:com.dropbox.core.http.OkHttp3Requestor: can't find referenced class okhttp3.OkHttpClient Warning:com.dropbox.core.http.OkHttp3Requestor: can't find referenced class okhttp3.Call Warning:com.dropbox.core.http.OkHttp3Requestor: can't find referenced class okhttp3.Response Warning:com.dropbox.core.http.OkHttp3Requestor: can't find referenced class okhttp3.ResponseBody Warning:com.dropbox.core.http.OkHttp3Requestor: can't find referenced class okhttp3.Request$Builder Warning:com.dropbox.core.http.OkHttp3Requestor: can't find referenced class okhttp3.Headers Warning:com.dropbox.core.http.OkHttp3Requestor: can't find referenced class okhttp3.OkHttpClient Warning:com.dropbox.core.http.OkHttp3Requestor: can't find referenced class okhttp3.Dispatcher Warning:com.dropbox.core.http.OkHttp3Requestor: can't find referenced class okhttp3.Request Warning:com.dropbox.core.http.OkHttp3Requestor: can't find referenced class okhttp3.Call Warning:com.dropbox.core.http.OkHttp3Requestor: can't find referenced class okhttp3.Response Warning:com.dropbox.core.http.OkHttp3Requestor: can't find referenced class okhttp3.ResponseBody Warning:com.dropbox.core.http.OkHttp3Requestor: can't find referenced class okhttp3.Headers Warning:com.dropbox.core.http.OkHttp3Requestor: can't find referenced class okhttp3.OkHttpClient Warning:com.dropbox.core.http.OkHttp3Requestor: can't find referenced class okhttp3.Request$Builder Warning:com.dropbox.core.http.OkHttp3Requestor: can't find referenced class okhttp3.Response Warning:com.dropbox.core.http.OkHttp3Requestor: can't find referenced class okhttp3.Request$Builder Warning:com.dropbox.core.http.OkHttp3Requestor: can't find referenced class okhttp3.Response Warning:com.dropbox.core.http.OkHttp3Requestor: can't find referenced class okhttp3.Request$Builder Warning:com.dropbox.core.http.OkHttp3Requestor: can't find referenced class okhttp3.Headers Warning:com.dropbox.core.http.OkHttp3Requestor: can't find referenced class okhttp3.OkHttpClient Warning:com.dropbox.core.http.OkHttp3Requestor: can't find referenced class okhttp3.Headers Warning:com.dropbox.core.http.OkHttp3Requestor$AsyncCallback: can't find referenced class okhttp3.Callback Warning:com.dropbox.core.http.OkHttp3Requestor$AsyncCallback: can't find referenced class okhttp3.Response Warning:com.dropbox.core.http.OkHttp3Requestor$AsyncCallback: can't find referenced class okhttp3.Call Warning:com.dropbox.core.http.OkHttp3Requestor$AsyncCallback: can't find referenced class okhttp3.Response Warning:com.dropbox.core.http.OkHttp3Requestor$AsyncCallback: can't find referenced class okhttp3.Call Warning:com.dropbox.core.http.OkHttp3Requestor$AsyncCallback: can't find referenced class okhttp3.Response Warning:com.dropbox.core.http.OkHttp3Requestor$BufferedUploader: can't find referenced class okhttp3.Request$Builder Warning:com.dropbox.core.http.OkHttp3Requestor$BufferedUploader: can't find referenced class okhttp3.OkHttpClient Warning:com.dropbox.core.http.OkHttp3Requestor$BufferedUploader: can't find referenced class okhttp3.Call Warning:com.dropbox.core.http.OkHttp3Requestor$BufferedUploader: can't find referenced class okhttp3.Request$Builder Warning:com.dropbox.core.http.OkHttp3Requestor$BufferedUploader: can't find referenced class okhttp3.RequestBody Warning:com.dropbox.core.http.OkHttp3Requestor$BufferedUploader: can't find referenced class okhttp3.Call Warning:com.dropbox.core.http.OkHttp3Requestor$BufferedUploader: can't find referenced class okhttp3.Response Warning:com.dropbox.core.http.OkHttp3Requestor$BufferedUploader: can't find referenced class okhttp3.ResponseBody Warning:com.dropbox.core.http.OkHttp3Requestor$BufferedUploader: can't find referenced class okhttp3.Request$Builder Warning:com.dropbox.core.http.OkHttp3Requestor$BufferedUploader: can't find referenced class okhttp3.Response Warning:com.dropbox.core.http.OkHttp3Requestor$BufferedUploader: can't find referenced class okhttp3.OkHttpClient Warning:com.dropbox.core.http.OkHttp3Requestor$BufferedUploader: can't find referenced class okhttp3.Call Warning:com.dropbox.core.http.OkHttp3Requestor$BufferedUploader: can't find referenced class okhttp3.RequestBody Warning:com.dropbox.core.http.OkHttp3Requestor$BufferedUploader: can't find referenced class okhttp3.Response Warning:com.dropbox.core.http.OkHttp3Requestor$BufferedUploader: can't find referenced class okhttp3.ResponseBody Warning:com.dropbox.core.http.OkHttp3Requestor$BufferedUploader: can't find referenced class okhttp3.Request Warning:com.dropbox.core.http.OkHttp3Requestor$BufferedUploader: can't find referenced class okhttp3.Request$Builder Warning:com.dropbox.core.http.OkHttp3Requestor$BufferedUploader: can't find referenced class okhttp3.RequestBody Warning:com.dropbox.core.http.OkHttp3Requestor$BufferedUploader: can't find referenced class okhttp3.Call Warning:com.dropbox.core.http.OkHttp3Requestor$BufferedUploader: can't find referenced class okhttp3.Request$Builder Warning:com.dropbox.core.http.OkHttp3Requestor$BufferedUploader: can't find referenced class okhttp3.RequestBody Warning:com.dropbox.core.http.OkHttp3Requestor$BufferedUploader: can't find referenced class okhttp3.Response Warning:com.dropbox.core.http.OkHttp3Requestor$PipedRequestBody: can't find referenced class okhttp3.RequestBody Warning:com.dropbox.core.http.OkHttp3Requestor$PipedRequestBody: can't find referenced class okhttp3.MediaType Warning:com.dropbox.core.http.OkHttp3Requestor$PipedRequestBody: can't find referenced class okio.BufferedSink Warning:com.dropbox.core.http.OkHttpRequestor: can't find referenced class com.squareup.okhttp.OkHttpClient Warning:com.dropbox.core.http.OkHttpRequestor: can't find referenced class com.squareup.okhttp.Dispatcher Warning:com.dropbox.core.http.OkHttpRequestor: can't find referenced class com.squareup.okhttp.OkHttpClient Warning:com.dropbox.core.http.OkHttpRequestor: can't find referenced class com.squareup.okhttp.Request$Builder Warning:com.dropbox.core.http.OkHttpRequestor: can't find referenced class com.squareup.okhttp.OkHttpClient Warning:com.dropbox.core.http.OkHttpRequestor: can't find referenced class com.squareup.okhttp.Call Warning:com.dropbox.core.http.OkHttpRequestor: can't find referenced class com.squareup.okhttp.Response Warning:com.dropbox.core.http.OkHttpRequestor: can't find referenced class com.squareup.okhttp.ResponseBody Warning:com.dropbox.core.http.OkHttpRequestor: can't find referenced class com.squareup.okhttp.Request$Builder Warning:com.dropbox.core.http.OkHttpRequestor: can't find referenced class com.squareup.okhttp.Headers Warning:com.dropbox.core.http.OkHttpRequestor: can't find referenced class com.squareup.okhttp.OkHttpClient Warning:com.dropbox.core.http.OkHttpRequestor: can't find referenced class com.squareup.okhttp.Dispatcher Warning:com.dropbox.core.http.OkHttpRequestor: can't find referenced class com.squareup.okhttp.Request Warning:com.dropbox.core.http.OkHttpRequestor: can't find referenced class com.squareup.okhttp.Call Warning:com.dropbox.core.http.OkHttpRequestor: can't find referenced class com.squareup.okhttp.Response Warning:com.dropbox.core.http.OkHttpRequestor: can't find referenced class com.squareup.okhttp.ResponseBody Warning:com.dropbox.core.http.OkHttpRequestor: can't find referenced class com.squareup.okhttp.Headers Warning:com.dropbox.core.http.OkHttpRequestor: can't find referenced class com.squareup.okhttp.OkHttpClient Warning:com.dropbox.core.http.OkHttpRequestor: can't find referenced class com.squareup.okhttp.Request$Builder Warning:com.dropbox.core.http.OkHttpRequestor: can't find referenced class com.squareup.okhttp.Response Warning:com.dropbox.core.http.OkHttpRequestor: can't find referenced class com.squareup.okhttp.Request$Builder Warning:com.dropbox.core.http.OkHttpRequestor: can't find referenced class com.squareup.okhttp.Response Warning:com.dropbox.core.http.OkHttpRequestor: can't find referenced class com.squareup.okhttp.Request$Builder Warning:com.dropbox.core.http.OkHttpRequestor: can't find referenced class com.squareup.okhttp.Headers Warning:com.dropbox.core.http.OkHttpRequestor: can't find referenced class com.squareup.okhttp.OkHttpClient Warning:com.dropbox.core.http.OkHttpRequestor: can't find referenced class com.squareup.okhttp.Headers Warning:com.dropbox.core.http.OkHttpRequestor$AsyncCallback: can't find referenced class com.squareup.okhttp.Callback Warning:com.dropbox.core.http.OkHttpRequestor$AsyncCallback: can't find referenced class com.squareup.okhttp.Response Warning:com.dropbox.core.http.OkHttpRequestor$AsyncCallback: can't find referenced class com.squareup.okhttp.Request Warning:com.dropbox.core.http.OkHttpRequestor$AsyncCallback: can't find referenced class com.squareup.okhttp.Response Warning:com.dropbox.core.http.OkHttpRequestor$BufferedUploader: can't find referenced class com.squareup.okhttp.Request$Builder Warning:com.dropbox.core.http.OkHttpRequestor$BufferedUploader: can't find referenced class com.squareup.okhttp.OkHttpClient Warning:com.dropbox.core.http.OkHttpRequestor$BufferedUploader: can't find referenced class com.squareup.okhttp.Call Warning:com.dropbox.core.http.OkHttpRequestor$BufferedUploader: can't find referenced class com.squareup.okhttp.Request$Builder Warning:com.dropbox.core.http.OkHttpRequestor$BufferedUploader: can't find referenced class com.squareup.okhttp.RequestBody Warning:com.dropbox.core.http.OkHttpRequestor$BufferedUploader: can't find referenced class com.squareup.okhttp.Call Warning:com.dropbox.core.http.OkHttpRequestor$BufferedUploader: can't find referenced class com.squareup.okhttp.Response Warning:com.dropbox.core.http.OkHttpRequestor$BufferedUploader: can't find referenced class com.squareup.okhttp.ResponseBody Warning:com.dropbox.core.http.OkHttpRequestor$BufferedUploader: can't find referenced class com.squareup.okhttp.Request$Builder Warning:com.dropbox.core.http.OkHttpRequestor$BufferedUploader: can't find referenced class com.squareup.okhttp.Response Warning:com.dropbox.core.http.OkHttpRequestor$BufferedUploader: can't find referenced class com.squareup.okhttp.OkHttpClient Warning:com.dropbox.core.http.OkHttpRequestor$BufferedUploader: can't find referenced class com.squareup.okhttp.Call Warning:com.dropbox.core.http.OkHttpRequestor$BufferedUploader: can't find referenced class com.squareup.okhttp.RequestBody Warning:com.dropbox.core.http.OkHttpRequestor$BufferedUploader: can't find referenced class com.squareup.okhttp.Response Warning:com.dropbox.core.http.OkHttpRequestor$BufferedUploader: can't find referenced class com.squareup.okhttp.ResponseBody Warning:com.dropbox.core.http.OkHttpRequestor$BufferedUploader: can't find referenced class com.squareup.okhttp.Request Warning:com.dropbox.core.http.OkHttpRequestor$BufferedUploader: can't find referenced class com.squareup.okhttp.Request$Builder Warning:com.dropbox.core.http.OkHttpRequestor$BufferedUploader: can't find referenced class com.squareup.okhttp.RequestBody Warning:com.dropbox.core.http.OkHttpRequestor$BufferedUploader: can't find referenced class com.squareup.okhttp.Call Warning:com.dropbox.core.http.OkHttpRequestor$BufferedUploader: can't find referenced class com.squareup.okhttp.Request$Builder Warning:com.dropbox.core.http.OkHttpRequestor$BufferedUploader: can't find referenced class com.squareup.okhttp.RequestBody Warning:com.dropbox.core.http.OkHttpRequestor$BufferedUploader: can't find referenced class com.squareup.okhttp.Response Warning:com.dropbox.core.http.OkHttpRequestor$PipedRequestBody: can't find referenced class com.squareup.okhttp.RequestBody Warning:com.dropbox.core.http.OkHttpRequestor$PipedRequestBody: can't find referenced class com.squareup.okhttp.MediaType Warning:com.dropbox.core.http.OkHttpRequestor$PipedRequestBody: can't find referenced class okio.BufferedSink Warning:com.dropbox.core.http.OkHttpUtil$PipedStream: can't find referenced class okio.Okio Warning:com.dropbox.core.http.OkHttpUtil$PipedStream: can't find referenced class okio.BufferedSink Warning:com.dropbox.core.http.OkHttpUtil$PipedStream: can't find referenced class okio.Okio Warning:com.dropbox.core.http.OkHttpUtil$PipedStream: can't find referenced class okio.BufferedSink Warning:com.google.common.cache.Striped64: can't find referenced class sun.misc.Unsafe Warning:com.google.common.cache.Striped64$1: can't find referenced class sun.misc.Unsafe Warning:com.google.common.cache.Striped64$Cell: can't find referenced class sun.misc.Unsafe Warning:com.google.common.primitives.UnsignedBytes$LexicographicalComparatorHolder$UnsafeComparator: can't find referenced class sun.misc.Unsafe Warning:com.google.common.primitives.UnsignedBytes$LexicographicalComparatorHolder$UnsafeComparator$1: can't find referenced class sun.misc.Unsafe Warning:com.squareup.picasso.OkHttpDownloader: can't find referenced class com.squareup.okhttp.OkHttpClient Warning:com.squareup.picasso.OkHttpDownloader: can't find referenced class com.squareup.okhttp.Cache Warning:com.squareup.picasso.OkHttpDownloader: can't find referenced class com.squareup.okhttp.OkHttpClient Warning:com.squareup.picasso.OkHttpDownloader: can't find referenced class com.squareup.okhttp.CacheControl Warning:com.squareup.picasso.OkHttpDownloader: can't find referenced class com.squareup.okhttp.CacheControl$Builder Warning:com.squareup.picasso.OkHttpDownloader: can't find referenced class com.squareup.okhttp.Request$Builder Warning:com.squareup.picasso.OkHttpDownloader: can't find referenced class com.squareup.okhttp.OkHttpClient Warning:com.squareup.picasso.OkHttpDownloader: can't find referenced class com.squareup.okhttp.Call Warning:com.squareup.picasso.OkHttpDownloader: can't find referenced class com.squareup.okhttp.Response Warning:com.squareup.picasso.OkHttpDownloader: can't find referenced class com.squareup.okhttp.ResponseBody Warning:com.squareup.picasso.OkHttpDownloader: can't find referenced class com.squareup.okhttp.Response Warning:com.squareup.picasso.OkHttpDownloader: can't find referenced class com.squareup.okhttp.ResponseBody Warning:com.squareup.picasso.OkHttpDownloader: can't find referenced class com.squareup.okhttp.OkHttpClient Warning:com.squareup.picasso.OkHttpDownloader: can't find referenced class com.squareup.okhttp.Cache Warning:com.squareup.picasso.OkHttpDownloader: can't find referenced class com.squareup.okhttp.CacheControl Warning:com.squareup.picasso.OkHttpDownloader: can't find referenced class com.squareup.okhttp.CacheControl$Builder Warning:com.squareup.picasso.OkHttpDownloader: can't find referenced class com.squareup.okhttp.Request$Builder Warning:com.squareup.picasso.OkHttpDownloader: can't find referenced class com.squareup.okhttp.Response Warning:com.squareup.picasso.OkHttpDownloader: can't find referenced class com.squareup.okhttp.Cache Warning:com.squareup.picasso.OkHttpDownloader: can't find referenced class com.squareup.okhttp.CacheControl Warning:com.squareup.picasso.OkHttpDownloader: can't find referenced class com.squareup.okhttp.Request Warning:com.squareup.picasso.OkHttpDownloader: can't find referenced class com.squareup.okhttp.Call Warning:com.squareup.picasso.OkHttpDownloader: can't find referenced class com.squareup.okhttp.Response Warning:com.squareup.picasso.OkHttpDownloader: can't find referenced class com.squareup.okhttp.ResponseBody Warning:com.squareup.picasso.OkHttpDownloader: can't find referenced class com.squareup.okhttp.OkHttpClient Warning:com.squareup.picasso.OkHttpDownloader: can't find referenced class com.squareup.okhttp.CacheControl$Builder Warning:com.squareup.picasso.OkHttpDownloader: can't find referenced class com.squareup.okhttp.CacheControl Warning:com.squareup.picasso.OkHttpDownloader: can't find referenced class com.squareup.okhttp.Request$Builder Warning:com.squareup.picasso.OkHttpDownloader: can't find referenced class com.squareup.okhttp.Response Warning:com.squareup.picasso.OkHttpDownloader: can't find referenced class com.squareup.okhttp.ResponseBody Warning:com.squareup.picasso.OkHttpDownloader: can't find referenced class com.squareup.okhttp.Cache Warning:there were 355 unresolved references to classes or interfaces. Warning:Exception while processing task java.io.IOException: Please correct the above warnings first. Error:Execution failed for task ':app:transformClassesAndResourcesWithProguardForRelease'. > java.io.IOException: Please correct the above warnings first.

So, I added these lines to the progard-rules.pro file:

 -keep com.dropbox.** {*;} -keep com.google.common.** {*;} -keep com.square.picasso.** {*;}

But then I get this error:

 Warning:Exception while processing task java.io.IOException: proguard.ParseException: Unexpected keyword 'com.dropbox.**' in line 18 of file '/home/AndroidProjects/Poolex/app/proguard-rules.pro' Error:Execution failed for task ':app:transformClassesAndResourcesWithProguardForRelease'. > java.io.IOException: proguard.ParseException: Unexpected keyword 'com.dropbox.**' in line 18 of file '/home/AndroidProjects/Poolex/app/proguard-rules.pro'

How can i solve this?

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3 answers

If you want, you can ignore all errors from proguard and try to see if the application works. I use this -dontwarn **
ignore all errors. If this does not work, try: -keep **
And if you want to do this with only one, use as -keep class com.dropbox.**
or
-ignore com.dropbox.**

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Try the following:

 -keep class com.dropbox.** {*;} -keep class com.google.common.** {*;} -keep class com.square.picasso.** {*;}
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Add to proguard-rules.pro this:

 -dontwarn okio.** -dontwarn okhttp3.** -dontwarn com.squareup.okhttp.** -dontwarn com.google.appengine.** -dontwarn javax.servlet.** # Support classes for compatibility with older API versions -dontwarn android.support.** -dontnote android.support.**

Make sure in build.gradle(Module:app) you get:

 proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'

in the android > buildTypes > release block.

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Source: https://habr.com/ru/post/1259854/

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