fix expected error message in addPackages() test
fix expected error message in addPackages() test

kemitchell/newww,aredridel/newww,nexdrew/newww,kemitchell/newww,aredridel/newww,nexdrew/newww,nexdrew/newww,watilde/newww,watilde/newww,aredridel/newww,watilde/newww,kemitchell/newww