I do hope this helps someone... Upgraded XCode from an old version to the version that works with El Capitan. Got the same error after messing with the info.plist file. Reverted that file back and still had this new problem when trying to run code in the simulator. The solution for me was to rename the Product Name in Build Settings - I changed a space for an underscore. That didn't work, I then changed it back exactly as it was originally (with a space) and it worked?!?!