Histogram with run_id '0' was not found in the specified XML source.

hi,
    when i am trying to generate event with pythia8 on then this problem occurs with event generation. the debug log is following

#************************************************************
#* MadGraph5_aMC@NLO/MadEvent *
#* *
#* * * *
#* * * * * *
#* * * * * 5 * * * * *
#* * * * * *
#* * * *
#* *
#* *
#* VERSION 2.6.6 2018-06-28 *
#* *
#* 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_05
Traceback (most recent call last):
  File "/home/abhi/Music/MG5_aMC_v2_6_6/madgraph/interface/extended_cmd.py", line 1514, in onecmd
    return self.onecmd_orig(line, **opt)
  File "/home/abhi/Music/MG5_aMC_v2_6_6/madgraph/interface/extended_cmd.py", line 1463, in onecmd_orig
    return func(arg, **opt)
  File "/home/abhi/Music/MG5_aMC_v2_6_6/madgraph/interface/madevent_interface.py", line 2469, in do_generate_events
    self.run_generate_events(switch_mode, args)
  File "/home/abhi/Music/MG5_aMC_v2_6_6/madgraph/interface/common_run_interface.py", line 6929, in new_fct
    original_fct(obj, *args, **opts)
  File "/home/abhi/Music/MG5_aMC_v2_6_6/madgraph/interface/madevent_interface.py", line 2577, in run_generate_events
    self.exec_cmd('shower --no_default', postcmd=False, printcmd=False)
  File "/home/abhi/Music/MG5_aMC_v2_6_6/madgraph/interface/extended_cmd.py", line 1543, in exec_cmd
    stop = Cmd.onecmd_orig(current_interface, line, **opt)
  File "/home/abhi/Music/MG5_aMC_v2_6_6/madgraph/interface/extended_cmd.py", line 1463, in onecmd_orig
    return func(arg, **opt)
  File "/home/abhi/Music/MG5_aMC_v2_6_6/madgraph/interface/madevent_interface.py", line 3852, in do_shower
    postcmd=False, printcmd=False)
  File "/home/abhi/Music/MG5_aMC_v2_6_6/madgraph/interface/extended_cmd.py", line 1543, in exec_cmd
    stop = Cmd.onecmd_orig(current_interface, line, **opt)
  File "/home/abhi/Music/MG5_aMC_v2_6_6/madgraph/interface/extended_cmd.py", line 1463, in onecmd_orig
    return func(arg, **opt)
  File "/home/abhi/Music/MG5_aMC_v2_6_6/madgraph/interface/madevent_interface.py", line 4582, in do_pythia8
    new_djr_HwU = histograms.HwUList(djr_file,run_id=0)
  File "/home/abhi/Music/MG5_aMC_v2_6_6/madgraph/various/histograms.py", line 1651, in __init__
    raw_labels=raw_labels)
  File "/home/abhi/Music/MG5_aMC_v2_6_6/madgraph/various/histograms.py", line 1767, in parse_histos_from_PY8_XML_stream
    "specified XML source."
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
          cluster_temp_path : None
             cluster_memory : None (user set)
               cluster_size : 100
              cluster_queue : None (user set)
                    nb_core : 4 (user set)
               cluster_time : 4 (user set)
                   run_mode : 2

                      Configuration Options
                      ---------------------
                text_editor : None
         cluster_local_path : None
      cluster_status_update : (600, 30)
               pythia8_path : /home/abhi/Music/MG5_aMC_v2_6_6/HEPTools/pythia8 (user set)
                  hwpp_path : None (user set)
            pythia-pgs_path : None (user set)
                    td_path : None (user set)
               delphes_path : None (user set)
                thepeg_path : None (user set)
               cluster_type : condor
          madanalysis5_path : None (user set)
           cluster_nb_retry : 1
                 eps_viewer : None
                web_browser : None
               syscalc_path : None (user set)
           madanalysis_path : None (user set)
                     lhapdf : /home/abhi/Music/MG5_aMC_v2_6_6/HEPTools/lhapdf6/bin/lhapdf-config (user set)
              f2py_compiler : None
                 hepmc_path : None (user set)
         cluster_retry_wait : 300
           fortran_compiler : None
                auto_update : 7 (user set)
        exrootanalysis_path : None (user set)
                    timeout : 60
               cpp_compiler : None

 but without pythia8 the event generation is perfect. i need that .hepmc file for further analysis but cant generate though. please help me with this problem.