Dear MadGraph experts, I tried to generate different processes at leading order, with both versions 2.8.2 and 3.0.4, using a restriction of the SMEFTatNLO model, but every time I specify a NP coupling value (like NP^2==2), I get the error reported at the end of this message. I did the same before, but it's the first time this error occurs to me. Do you have any hint about what could be wrong? This is my PYTHONPATH variable: :/home/matteo/.local/lib/python3.8/site-packages:/home/matteo/Scrivania/MG5_aMC_v2_8_2/HEPTools/lhapdf6_py3//lib/python3.8/site-packages/ and here is the error: Generated helas calls for 7 subprocesses (699 diagrams) in 1.637 s Wrote files for 1116 helas calls in 1.017 s Fatal Python error: Cannot recover from stack overflow. Python runtime state: initialized Thread 0x00007f15a7262700 (most recent call first): File "/usr/lib/python3.8/threading.py", line 302 in wait File "/usr/lib/python3.8/queue.py", line 170 in get File "/home/matteo/Scrivania/MG5_aMC_v2_8_2/madgraph/various/cluster.py", line 631 in worker File "/usr/lib/python3.8/threading.py", line 870 in run File "/usr/lib/python3.8/threading.py", line 932 in _bootstrap_inner File "/usr/lib/python3.8/threading.py", line 890 in _bootstrap Current thread 0x00007f15a88d9740 (most recent call first): File "", line 973 in get_data File "", line 874 in get_code File "", line 779 in exec_module File "", line 671 in _load_unlocked File "", line 975 in _find_and_load_unlocked File "", line 991 in _find_and_load File "/home/matteo/Scrivania/MG5_aMC_v2_8_2/models/SMEFTatNLO/particles.py", line 10 in File "", line 219 in _call_with_frames_removed File "", line 783 in exec_module File "", line 671 in _load_unlocked File "", line 975 in _find_and_load_unlocked File "", line 991 in _find_and_load File "/home/matteo/Scrivania/MG5_aMC_v2_8_2/models/SMEFTatNLO/__init__.py", line 3 in File "", line 219 in _call_with_frames_removed File "", line 783 in exec_module File "", line 671 in _load_unlocked File "", line 975 in _find_and_load_unlocked File "", line 991 in _find_and_load File "/home/matteo/Scrivania/MG5_aMC_v2_8_2/models/__init__.py", line 42 in load_model File "/home/matteo/Scrivania/MG5_aMC_v2_8_2/models/__init__.py", line 50 in load_model File "/home/matteo/Scrivania/MG5_aMC_v2_8_2/models/__init__.py", line 50 in load_model File "/home/matteo/Scrivania/MG5_aMC_v2_8_2/models/__init__.py", line 50 in load_model ... Aborted (core dumped)

When	Who	Action	New State
2021-04-07	Olivier Mattelaer	Answer	Answered
2021-04-07	matteo maltoni	Reopen	Open
2021-04-08	Olivier Mattelaer	Answer	Answered
2021-04-09	matteo maltoni	Comment	Answered
2021-04-09	Olivier Mattelaer	Answer	Answered
2021-04-09	matteo maltoni	Confirm	Solved

MadGraph5_aMC@NLO

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