Command "generate_events run_01" interrupted with error: Exception :

Adding: I checked that I can reproduce this in another system. The run_card includes bias:

# Generation bias, check the wiki page below for more information: *
# 'cp3.irmp.ucl.ac.be/projects/madgraph/wiki/LOEventGenerationBias' *
#*********************************************************************
 /Users/ben/docs/papers/22-shenoy-1/ptl_bias = bias_module ! Bias type of bias, [None, ptj_bias, -custom_folder-]
 {'ptl_bias_target_ptl': 3000.0, 'ptl_bias_enhancement_power': 4.0} = bias_parameters ! Specifies the parameters of the module.
#

The error occurs only when I have both the bias *and* add a second process as in
generate p p > ta- vt~
add process p p > ta- vt~ j

If I don't add a second process (and keep the bias) or don't use bias (but keep add process) no error is generated.

Ah yes, this is a (bad) limitation of the bias module that it only worked with a given multiplicity.

3.5.0 does offer new functionality that should go in that direction to avoid such issue.
But either the FAQ (https://answers.launchpad.net/mg5amcnlo/+faq/3326) is not up-to-date or this particular feature has not been implemented yet. (You can already look at the NLO implementation to have a feeling on how it works).

Cheers,

Olivier

So that feature was indeed not finalised.
This is now the case in this branch: https://github.com/mg5amcnlo/mg5amcnlo/tree/3.5.2
I'm updating the FAQ now to provide a LO example on how to do it at LO.

Thanks,

Olivier