I have taken SVN check-in for a project. Thereafter I have installed pod via terminal. After installation of pod there are few warning stating
It still happens from time to time to me. My solution is to search after the unknown UUID in your project file and simply delete all lines you'll find.
Terminal-command:
cat YOUR_PROCJECT_NAME.xcodeproj/project.pbxproj | grep 'UNKNOWN_UUID'
You should find something like this:
UNKNOWN_UUID /* (null) in Resources */,