I've been wracking my brain on this issue, never had it before. Tried so many different things. I am on a mac, attempting to deploy an Android version of our app. I keep getting this error: Error building Player: CommandInvokationFailure: Unable to convert classes into dex format. See the Console for details. /System/Library/Frameworks/JavaVM.framework/Versions/CurrentJDK/Home/bin/java -Xmx1024M -Dcom.android.sdkmanager.toolsdir="/Users/ixikos/adt/adt-bundle-mac-x86_64-20130729/sdk/tools" -Dfile.encoding=UTF8 -jar "/Applications/Unity/Unity.app/Contents/BuildTargetTools/AndroidPlayer/sdktools.jar" - I've tried installing different versions of the android sdk (18, 17, 16, 15, ... 6) Deleting and installing different versions of jdk. Any thoughts or experiences would be welcome.