Madevent fails

what is the content of ./MyFiles/LFVLNV/GenerationFiles/LNVF_run.dat
normally you would just execute madevent without any other file plugged in

Thanks for your response. Here's the content:

```
generate_events

shower=Pythia8
detector=Delphes

set use_syst False

set MF1 1000
set MS1 1500
set MS2 1500
set ge 0.1
set gqd 0.1
set gqu 0.0

set WS1 Auto
set WS2 Auto
set WF1 Auto

set xqcut 20
set ptj 20
set ptb 20
set ptl 20
set etaj 2.8
set etal 2.5
set ebeam1 7000
set ebeam2 7000
set nevents 600
set iseed 1

set JetMatching:nJetMax 3
```

I believe I fixed it by making the command be totally absolute paths.
`/work/pi_mjrm_umass_edu/LNV_collider/Generated/LNVF/bin/madevent
 /home/dkennedy_umass_edu/LNV/MG5_aMC_v3_5_4/MyFiles/LFVLNV/GenerationFiles/LNVF_run.dat`

So the exact issue here is that you launch from the madgraph directory, an executable which is in the local directory.
And the code is confused if he has to be running the madgraph code or the madevent code.

Not sure how to fix that in a clean way, what I will do is to detect in madevent if madgraph is in the pythonpath and put a clean crash with useful information.

So the code runs like this:

Running MG5 in debug mode
ERROR: Looks like you do have madgraph in your PYTHONPATH (or you run this executable from the main MG5aMC directory). This executable will likely not work in such case.
************************************************************
* *
* W E L C O M E to *
* M A D G R A P H 5 _ a M C @ N L O *
* M A D E V E N T *
* *
* * * *
* * * * * *
* * * * * 5 * * * * *
* * * * * *
* * * *
* *
* VERSION 2.9.21 2024-09-26 *
* *
* The MadGraph5_aMC@NLO Development Team - Find us at *
* https://server06.fynu.ucl.ac.be/projects/madgraph *
* *
* Type 'help' for in-line help. *
* *
************************************************************
Traceback (most recent call last):
  File "/Users/omattelaer/Documents/git_workspace/LTS/./PROC_sm_87/bin/madevent", line 212, in <module>
    cmd_line = cmd_interface.MadEventCmdShell(force_run=True)
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/omattelaer/Documents/git_workspace/LTS/PROC_sm_87/bin/internal/madevent_interface.py", line 2110, in __init__
    CmdExtended.__init__(self, me_dir, options, *completekey, **stdin)
  File "/Users/omattelaer/Documents/git_workspace/LTS/PROC_sm_87/bin/internal/madevent_interface.py", line 206, in __init__
    super(CmdExtended, self).__init__(me_dir, options, *arg, **opt)
  File "/Users/omattelaer/Documents/git_workspace/LTS/madgraph/interface/common_run_interface.py", line 643, in __init__
    if os.path.isabs(me_dir):
       ^^^^^^^^^^^^^^^^^^^^^
  File "<frozen posixpath>", line 62, in isabs
TypeError: expected str, bytes or os.PathLike object, not NoneType

Thanks,

Olivier

PS: change are here: https://github.com/mg5amcnlo/mg5amcnlo/commit/a90385c0afeaa3300f998f9949e84f1c2aacbf95

Thanks Olivier!
I've been able to get it running with `/work/pi_mjrm_umass_edu/LNV_collider/Generated/LNVF/bin/madevent
 /home/dkennedy_umass_edu/LNV/MG5_aMC_v3_5_4/MyFiles/LFVLNV/GenerationFiles/LNVF_run.dat` as well.