Error detected in "generate_events run_01" (Histogram with run_id '0' was not found in the specified XML source)

I just installed MG5 v3.3.2 on my Linux machine. Both Python (v3.9) and ROOT(v.26) were installed using conda.

I tested a very simple example (generate p p > e+ e-) but I got the following error message when running PY8:

INFO: Running Pythia8 [arXiv:1410.3012]
Splitting .lhe event file for PY8 parallelization...
Submitting Pythia8 jobs...
Pythia8 shower jobs: 1 Idle, 3 Running, 0 Done [3 seconds]
Pythia8 shower jobs: 0 Idle, 3 Running, 1 Done [3 seconds]
Pythia8 shower jobs: 0 Idle, 2 Running, 2 Done [3 seconds]
Pythia8 shower jobs: 0 Idle, 1 Running, 3 Done [3 seconds]
Pythia8 shower jobs: 0 Idle, 0 Running, 4 Done [3 seconds]
Merging results from the split PY8 runs...
Error detected in "generate_events run_01"
write debug file /home/seba/Programs/MG5_aMC_v3_3_2/testMG5/run_01_tag_1_debug.log
If you need help with this issue please contact us on https://answers.launchpad.net/mg5amcnlo
str : Histogram with run_id '0' was not found in the specified XML source.
quit
INFO: storing files of previous run
INFO: Done
INFO:

Here is the log file:

#************************************************************
#* MadGraph5_aMC@NLO/MadEvent *
#* *
#* * * *
#* * * * * *
#* * * * * 5 * * * * *
#* * * * * *
#* * * *
#* *
#* *
#* VERSION 3.3.2 2022-03-18 *
#* *
#* The MadGraph5_aMC@NLO Development Team - Find us at *
#* https://server06.fynu.ucl.ac.be/projects/madgraph *
#* *
#************************************************************
#* *
#* Command File for MadEvent *
#* *
#* run as ./bin/madevent.py filename *
#* *
#************************************************************
generate_events run_01
Traceback (most recent call last):
  File "/home/seba/Programs/MG5_aMC_v3_3_2/madgraph/interface/extended_cmd.py", line 1544, in onecmd
    return self.onecmd_orig(line, **opt)
  File "/home/seba/Programs/MG5_aMC_v3_3_2/madgraph/interface/extended_cmd.py", line 1493, in onecmd_orig
    return func(arg, **opt)
  File "/home/seba/Programs/MG5_aMC_v3_3_2/madgraph/interface/madevent_interface.py", line 2362, in do_generate_events
    self.run_generate_events(switch_mode, args)
  File "/home/seba/Programs/MG5_aMC_v3_3_2/madgraph/interface/common_run_interface.py", line 7295, in new_fct
    original_fct(obj, *args, **opts)
  File "/home/seba/Programs/MG5_aMC_v3_3_2/madgraph/interface/madevent_interface.py", line 2472, in run_generate_events
    self.exec_cmd('shower --no_default', postcmd=False, printcmd=False)
  File "/home/seba/Programs/MG5_aMC_v3_3_2/madgraph/interface/extended_cmd.py", line 1573, in exec_cmd
    stop = Cmd.onecmd_orig(current_interface, line, **opt)
  File "/home/seba/Programs/MG5_aMC_v3_3_2/madgraph/interface/extended_cmd.py", line 1493, in onecmd_orig
    return func(arg, **opt)
  File "/home/seba/Programs/MG5_aMC_v3_3_2/madgraph/interface/madevent_interface.py", line 3806, in do_shower
    self.exec_cmd('%s %s'%(shower,' '.join(args)),
  File "/home/seba/Programs/MG5_aMC_v3_3_2/madgraph/interface/extended_cmd.py", line 1573, in exec_cmd
    stop = Cmd.onecmd_orig(current_interface, line, **opt)
  File "/home/seba/Programs/MG5_aMC_v3_3_2/madgraph/interface/extended_cmd.py", line 1493, in onecmd_orig
    return func(arg, **opt)
  File "/home/seba/Programs/MG5_aMC_v3_3_2/madgraph/interface/madevent_interface.py", line 4548, in do_pythia8
    new_djr_HwU = histograms.HwUList(djr_file,run_id=0)
  File "/home/seba/Programs/MG5_aMC_v3_3_2/madgraph/various/histograms.py", line 1682, in __init__
    self.parse_histos_from_PY8_XML_stream(stream, run_id,
  File "/home/seba/Programs/MG5_aMC_v3_3_2/madgraph/various/histograms.py", line 1798, in parse_histos_from_PY8_XML_stream
    raise MadGraph5Error("Histogram with run_id '%d' was not found in the "%run_id+\
madgraph.MadGraph5Error: Histogram with run_id '0' was not found in the specified XML source.
                              Run Options
                              -----------
               stdout_level : 20 (user set)

                         MadEvent Options
                         ----------------
     automatic_html_opening : False (user set)
        notification_center : True
                   run_mode : 2
              cluster_queue : None (user set)
               cluster_time : None (user set)
               cluster_size : 100
             cluster_memory : 100 (user set)
                    nb_core : 4 (user set)
          cluster_temp_path : None

                      Configuration Options
                      ---------------------
               pythia8_path : /home/seba/Programs/MG5_aMC_v3_3_2/HEPTools/pythia8 (user set)
                  hwpp_path : None (user set)
                thepeg_path : None (user set)
                 hepmc_path : /home/seba/Programs/MG5_aMC_v3_3_2/HEPTools/hepmc (user set)
           madanalysis_path : None (user set)
          madanalysis5_path : None (user set)
            pythia-pgs_path : None (user set)
                    td_path : None (user set)
               delphes_path : /home/seba/Programs/MG5_aMC_v3_3_2/Delphes (user set)
        exrootanalysis_path : /home/seba/Programs/MG5_aMC_v3_3_2/ExRootAnalysis (user set)
               syscalc_path : None (user set)
                     lhapdf : /home/seba/Programs/MG5_aMC_v3_3_2/HEPTools/lhapdf6_py3/bin/lhapdf-config (user set)
                 lhapdf_py2 : None
                 lhapdf_py3 : /home/seba/Programs/MG5_aMC_v3_3_2/HEPTools/lhapdf6_py3/bin/lhapdf-config (user set)
                    timeout : 60
              f2py_compiler : None
          f2py_compiler_py2 : None
          f2py_compiler_py3 : None
                web_browser : None
                 eps_viewer : None
                text_editor : None
           fortran_compiler : None
               cpp_compiler : None
                auto_update : 7 (user set)
               cluster_type : condor
      cluster_status_update : (600, 30)
           cluster_nb_retry : 1
         cluster_local_path : None
         cluster_retry_wait : 300

What could be causing the error? Any guidance would be highly appreciated.