Hi Julien,
Actually I don't really remember, it was some time ago... But i read my previous messages and it seems that i got the "My work is done" message even when i got the same "error message" that you mention.
Did you try to launch a test case?
Otherwise, read again the previous posts and especially those dealing about the right lib folders and exe files. The installation with the gfortran installer did not work on my PC so I had to download the version corresponding to my own system configuration.
I attach my systel file. Please not that the name of the gfortran exe is the one corresponding to my PC and to the gfortran version i downloaded, so make sure you are adapting this the right way.
Good luck!
PL