Update:
The Problem seems to be more specific I think, becaue when I creat a new Application I got the error mentioned at the begin of these post
The launching Application Bundle ""/Users/Snoopy/Desktop/test/project1.app"" does not exist or is not executable.
See Project -> Project options -> Application
This problem can be solved as sekel told me by checking the checkbox at the Project options menu. After that everything works just wonderful.
But then later on ... I do not why the other error appears and I do not know what to do, or where it comes from ...
It seems to be an error in the application, but the tested applications just contain one empty form, so no difficult code ;-) .