The app wasn't able to find casparcg server.exe and didn't start.
Fixed by rebooting PC.
Comment from rrebuffo in forums:
"It did happen to me in the past. It is a bug that always forget to fix. It has to do with the windows scaling functions, it throws an error when trying to find the current monitor scale. Logging off and on fixes it."
The app wasn't able to find casparcg server.exe and didn't start. Fixed by rebooting PC. Comment from rrebuffo in forums: