Hi, I’m very sorry for that. Can you give me a little bit more details such that I can investigate. for example can you give me 1) the full path of your MG5 v2.3.3 directory 2) the full path from which you call the mg5_aMC executable 3) the full path of the directory which was removed Cheers, Olivier > On Dec 16, 2016, at 03:09, Sheng