Hi, I'm new to these tools, actually I even don't know the effect caused by this error.
```
generate_events run_04
Traceback (most recent call last):
File "/home/wm/MG5_aMC_v2_6_2/madgraph/interface/extended_cmd.py", line 1501, in onecmd
return self.onecmd_orig(line, **opt)
File "/home/wm/MG5_aMC_v2_6_2/madgraph/interface/extended_cmd.py", line 1450, in onecmd_orig
return func(arg, **opt)
File "/home/wm/MG5_aMC_v2_6_2/madgraph/interface/madevent_interface.py", line 2467, in do_generate_events
self.run_generate_events(switch_mode, args)
File "/home/wm/MG5_aMC_v2_6_2/madgraph/interface/common_run_interface.py", line 6685, in new_fct
original_fct(obj, *args, **opts)
File "/home/wm/MG5_aMC_v2_6_2/madgraph/interface/madevent_interface.py", line 2559, in run_generate_events
self.exec_cmd('reweight -from_cards', postcmd=False)
File "/home/wm/MG5_aMC_v2_6_2/madgraph/interface/extended_cmd.py", line 1528, in exec_cmd
stop = Cmd.onecmd_orig(current_interface, line, **opt)
File "/home/wm/MG5_aMC_v2_6_2/madgraph/interface/extended_cmd.py", line 1450, in onecmd_orig
return func(arg, **opt)
File "/home/wm/MG5_aMC_v2_6_2/madgraph/interface/common_run_interface.py", line 2138, in do_reweight
reweight_cmd.import_command_file(path)
File "/home/wm/MG5_aMC_v2_6_2/madgraph/interface/extended_cmd.py", line 1643, in import_command_file
self.exec_cmd(line, precmd=True)
File "/home/wm/MG5_aMC_v2_6_2/madgraph/interface/extended_cmd.py", line 1528, in exec_cmd
stop = Cmd.onecmd_orig(current_interface, line, **opt)
File "/home/wm/MG5_aMC_v2_6_2/madgraph/interface/extended_cmd.py", line 1450, in onecmd_orig
return func(arg, **opt)
File "/home/wm/MG5_aMC_v2_6_2/madgraph/various/misc.py", line 100, in f_with_no_logger
out = f(self, *args, **opt)
File "/home/wm/MG5_aMC_v2_6_2/madgraph/interface/reweight_interface.py", line 487, in do_launch
self.load_module()
File "/home/wm/MG5_aMC_v2_6_2/madgraph/interface/reweight_interface.py", line 1726, in load_module
mymod = __import__(mod_name, globals(), locals(), [],-1)
ImportError: No module named allmatrix2py
```
Thanks for the report,
I will double check to see if I can reproduce this issue locally (it will probably be not before Monday).
I might have more chance of success if you tell me,
1) your model
2) the process that you are using
3) which re-weighing you try to perform
4) which operating system you are using (and if not standard which version of python, numpy and gcc you are using)
Now the issue is related to the reweighting functionality.
That part of the code use a special method to evaluate the matrix-element since it use a python binding of a fortran code. (The reason is that such code is IO/parsing intensive and this is a nightmare to do in fortran but that the matrix-element needs to be in fortran for speed reason)
Looks like that such link fails to be created in your case.
Cheers,
Olivier
> On 2 May 2018, at 15:31, ComplicatedPhen omenon <email address hidden> wrote: wm/MG5_ aMC_v2_ 6_2/madgraph/ interface/ extended_ cmd.py" , line 1501, in onecmd orig(line, **opt) wm/MG5_ aMC_v2_ 6_2/madgraph/ interface/ extended_ cmd.py" , line 1450, in onecmd_orig wm/MG5_ aMC_v2_ 6_2/madgraph/ interface/ madevent_ interface. py", line 2467, in do_generate_events generate_ events( switch_ mode, args) wm/MG5_ aMC_v2_ 6_2/madgraph/ interface/ common_ run_interface. py", line 6685, in new_fct wm/MG5_ aMC_v2_ 6_2/madgraph/ interface/ madevent_ interface. py", line 2559, in run_generate_events cmd('reweight -from_cards', postcmd=False) wm/MG5_ aMC_v2_ 6_2/madgraph/ interface/ extended_ cmd.py" , line 1528, in exec_cmd orig(current_ interface, line, **opt) wm/MG5_ aMC_v2_ 6_2/madgraph/ interface/ extended_ cmd.py" , line 1450, in onecmd_orig wm/MG5_ aMC_v2_ 6_2/madgraph/ interface/ common_ run_interface. py", line 2138, in do_reweight cmd.import_ command_ file(path) wm/MG5_ aMC_v2_ 6_2/madgraph/ interface/ extended_ cmd.py" , line 1643, in import_command_file wm/MG5_ aMC_v2_ 6_2/madgraph/ interface/ extended_ cmd.py" , line 1528, in exec_cmd orig(current_ interface, line, **opt) wm/MG5_ aMC_v2_ 6_2/madgraph/ interface/ extended_ cmd.py" , line 1450, in onecmd_orig wm/MG5_ aMC_v2_ 6_2/madgraph/ various/ misc.py" , line 100, in f_with_no_logger wm/MG5_ aMC_v2_ 6_2/madgraph/ interface/ reweight_ interface. py", line 487, in do_launch wm/MG5_ aMC_v2_ 6_2/madgraph/ interface/ reweight_ interface. py", line 1726, in load_module _(mod_name, globals(), locals(), [],-1)
>
> Public bug reported:
>
>
> Hi, I'm new to these tools, actually I even don't know the effect caused by this error.
> ```
> generate_events run_04
> Traceback (most recent call last):
> File "/home/
> return self.onecmd_
> File "/home/
> return func(arg, **opt)
> File "/home/
> self.run_
> File "/home/
> original_fct(obj, *args, **opts)
> File "/home/
> self.exec_
> File "/home/
> stop = Cmd.onecmd_
> File "/home/
> return func(arg, **opt)
> File "/home/
> reweight_
> File "/home/
> self.exec_cmd(line, precmd=True)
> File "/home/
> stop = Cmd.onecmd_
> File "/home/
> return func(arg, **opt)
> File "/home/
> out = f(self, *args, **opt)
> File "/home/
> self.load_module()
> File "/home/
> mymod = __import_
> ImportError: No module named allmatrix2py
> ```
>
> ** Affects...