Board Thread:LotR Mod Technical Support/@comment-29680750-20170917130938/@comment-25330335-20170917202843

Well, I had a nice response, but wikia ate it alive...

The important line here is Process exited with code 255. The return value of a process is designed to give the user as much info as possible. This specific code only happens on Linux and OSX. Do some googling and see what you can find.