Error You can only specify a single Asset Catalog! Files specified: ....\Resources\Images\Battle.xcassets;....\Resources\Images\EndQuest.xcassets;....\Resources\Images\Images.xcassets;....\Resources\Images\Intro.xcassets;....\Resources\Images\Ritual.xcassets;....\Resources\Images\Scenes.xcassets Six Ages C:\WinObjC\msvc\sbresources.targets 73

As you can see, my app uses more than one (some of these have hundreds of images at different resolutions, and it's very handy to organize them into multiple catalogs).