In my case, I had the following in the project.properties file
target=android-18 proguard.config=proguard.cfg android.library=false android.library.reference.1=..\\com_facebook_android android.library.reference.2=../actionbarsherlock
After I changed the last line to
android.library.reference.2=..\\actionbarsherlock
actionbarsherlock.jar appeared in Android Dependancies, and I could run my application without exception java.lang.noclassdeffounderror
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