Hi, I can't reproduce this problem. Is this file exist? > /home/liangshang/MadGraph5_v1_5_12/my_second_mg5_run/Cards/run_card_default.dat and those one: > /home/liangshang/MadGraph5_v1_5_12/Template/Cards/run_card.dat > /home/liangshang/MadGraph5_v1_5_12/my_second_mg5_run/Cards/run_card.dat Those files should be present. Did you remove some of them? Please retry to generate the directory and/or reinstall MG5. Cheers, Olivier On Sep 2, 2013, at 5:06 AM, liangshang