Missing audio_mute.png

I'm using Unity 5.2 and the current XCode 7 and I get this error:

error: open /Users/thomas/Library/Developer/Xcode/DerivedData/Unity-iPhone-bdfxmzszafwxqpcblixcthndzlzf/Build/Products/Debug-iphoneos/app.app/UnityAds.bundle/audio_mute@2x.png: No such file or directory

error: open /Users/thomas/Library/Developer/Xcode/DerivedData/Unity-iPhone-bdfxmzszafwxqpcblixcthndzlzf/Build/Products/Debug-iphoneos/app.app/UnityAds.bundle/audio_mute.png.meta: No such file or directory

I build the iOS...

Missing audio_mute.png