Android Studio 2.0 Preview: ‘:app:transformClassesWithInstantRunForDebug’ FAILED

Resolved :

Disable the Instant Run option in Android Studio 2.0 Preview

See this screenshot

Something you can try is deleting the build folder. That does not always work but fixes it sometimes.

rm -rf cart/build

If that does not work. Run that command then in Android Studio select invalidate caches and restart.

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