XCode used to be able to launch SystemPreferences under Mojave. 

In the active scheme used for building, under Run / Info / Executable, I have 
SystemPreferences.app selected. "Launch" is set to "automatically". 
Now, after Xcode has (successfully) built my screensaver, I get this error 

- - - 
Details Launch error Domain: IDELaunchErrorDomain 
Code: 9 
Recovery Suggestion: There is a problem launching using posix_spawn (error 
code: 2). 
- - - 

Does anyone know what I could do?
Thanks a lot in advance.

Best regards, Gabriel.

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