Error building Player: IOException: android-support-v4.jar already exists

I started using a facebook, twitter, … asset bought from the store and now whenever I try to build for android I get this error:

Error building Player: IOException: Temp\StagingArea\plugins\android-support-v4.jar already exists

Any ideas?

FOUND SOLOTION (WELL, IT WORKS…): I just removed android-support-v4.jar from Assets\Plugins\Android and it started working.

This .jar should be in the /libs folder in your project - see if there is another one somewhere in your project and remove it.

**Unity automatically generates one in the Temp/StagingArea/plugins/android-support-v4.jar SO delete android-support-v4.jar from your project and will work fine **