I have been tired after trying to solve this problem for last 2 days. My project was OK before implementing Appodeal. But after implementing Appodeal this error is occurred. I have seen several solution for the same type problem. But I didn't get solution for duplicate entry of DefaultItemAnimator$2.class
Error:Execution failed for task ':app:transformClassesWithJarMergingForDebug'.> com.android.build.api.transform.TransformException: java.util.zip.ZipException: duplicate entry: android/support/v7/widget/DefaultItemAnimator$2.class