Hi Andrew, Thanks so much for those very helpful bug report and for your patience. The problem is that I forget to pass to the information about the non standard multi-particles for the reweighting module. I've fix this now, and your process goes trough. Note that you don't have to regenerate the sample to test that part of the code: The following command will make it to go trough: ./bin/mg5 launch PATH -i reweight run_01 Cheers, Olivier On Dec 8, 2013, at 9:40 PM, Andrew Levin