after update i. I also have this situation. Remove any apt as "com.neenbedankt.gradle.plugins:android-apt:1.8" from the path to the dependency classes
but before that .. invalidate the AS cache / restart and clear the gradle.
then
dependencies { classpath 'com.jakewharton:butterknife-gradle-plugin:8.5.1' }
then
apply plugin: 'com.jakewharton.butterknife'
then
compile "com.jakewharton:butterknife:8.5.1", annotationProcessor "com.jakewharton:butterknife-compiler:8.5.1"
lastly..put this is in the last module of the application
configurations.all { resolutionStrategy { force "com.android.support:support-annotations:25.2.0" } }
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