I am building a singleplayer project the the tool and if I try to open the .rpf file it gives me the following error:

Also the clothes are not loading correctly in singleplayer. (probably because of the corrupted file)

I already tried to create a new project but still the same problem.
In the statuslog.txt I can't find an error.

This seems to happen if the RPF File (in this case for female) exceeds 1GB-1,5GB. This only happens for Female RPF, not for the Male RPF!