Simple solution: Open Xcode. Select the “Window” menu. Select “Devices and Simulators”. Select Simulators tab. Click on the “+” icon at the left bottom. Choose the desired device & preferred iOS. Click “Create”. Enjoy :).
If you can open the Project You can simply change your Project Format (like the image) Click to your Project File in xcode and change it If you can’t open the project (projectName.xcodeproj) normally Control-click on the project file, select Show Package Contents, and then open your project.pbxproj file and make the change for: compatibilityVersion … Read more
I managed to find the problem. The problem was that I had added some keys to a property list file that was not valid. I found the error by looking in the log file that was located here: ~/Library/Logs/CoreSimulator/