Command /Applications/Xcode-beta.app/Contents/Developer/usr/bin/actool failed with exit code 255

Question

It happens in new Xcode7 beta:

CompileAssetCatalog /Users/admin/Library/Developer/Xcode/DerivedData/InstaAd-ddgdnbxlpxipirebpndfmgrxspel/Build/Products/Debug-iph         


        

Answer 1

Simple restart of Xcode fixed the error for me.