perlapp exit code

Hi,
we are watching exit code 5 from time to time when we create an exe file from a perl script.
The problem is not reproducible, but when it happens the next call with the same parameters will exit with exit code 5 too. When I start perlapp in a new cmd window for the same script with the same partameters it will work.
Is there a list available with meaning of different exit codes, especially exit code 5?