B4J Question Problem with B4JPackager

My app runs fine if i open the Jar file directly on my Mac.
Ive created an Installer with B4JPackager and install the app without any problems
But when i start one function i get this error:

Application Specific Information:
*** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'utility panels cannot be fullscreen primary'

Click to expand...

In this Function i create a new form with the Style "UTILITY". I dont know what he means with fullscreen, i initialize the Form with 200x200.

Anyway, this only happens with the installed Programm