Java finished with non-zero exit value 2 - Android Gradle

Question

I\'m getting this error executing my Android app (I cleaned it and then built it, but the error is still present)

• Sync: OK
• Make Project: OK

Answer 1

I didn't know (by then) that "compile fileTree(dir: 'libs', include: ['*.jar'])" compile all that has jar extension on libs folder, so i just comment (or delete) this lines:

//compile 'com.squareup.retrofit:retrofit:1.9.0'
//compile 'com.squareup.okhttp:okhttp-urlconnection:2.2.0'
//compile 'com.squareup.okhttp:okhttp:2.2.0'

//compile files('libs/spotify-web-api-android-master-0.1.0.jar')
//compile files('libs/okio-1.3.0.jar')

and it works fine. Thanks anyway! My bad.