Hi again Rikkert,

The fix induced a different error:
launch
Traceback (most recent call last):
  File "/nfs/scratch/fynu/elfaham/4tops_dir_dim62f/dim62f/sm_dim62f_ctZ/bin/internal/extended_cmd.py", line 1544, in onecmd
    return self.onecmd_orig(line, **opt)
  File "/nfs/scratch/fynu/elfaham/4tops_dir_dim62f/dim62f/sm_dim62f_ctZ/bin/internal/extended_cmd.py", line 1493, in onecmd_orig
    return func(arg, **opt)
  File "/nfs/scratch/fynu/elfaham/4tops_dir_dim62f/dim62f/sm_dim62f_ctZ/bin/internal/amcatnlo_run_interface.py", line 1784, in do_launch
    evt_file = self.run(mode, options)
  File "/nfs/scratch/fynu/elfaham/4tops_dir_dim62f/dim62f/sm_dim62f_ctZ/bin/internal/amcatnlo_run_interface.py", line 1941, in run
    jobs_to_collect,integration_step,mode,mode_dict[mode])
  File "/nfs/scratch/fynu/elfaham/4tops_dir_dim62f/dim62f/sm_dim62f_ctZ/bin/internal/amcatnlo_run_interface.py", line 2259, in collect_the_results
    self.append_the_results(jobs_to_run,integration_step)
  File "/nfs/scratch/fynu/elfaham/4tops_dir_dim62f/dim62f/sm_dim62f_ctZ/bin/internal/amcatnlo_run_interface.py", line 2752, in append_the_results
    '\n'.join(error_log)+'\n')
aMCatNLOError: An error occurred during the collection of results.
Please check the .log files inside the directories which failed:
/nfs/scratch/fynu/elfaham/4tops_dir_dim62f/dim62f/sm_dim62f_ctZ/SubProcesses/P0_gg_tttxtx/born_G24/log.txt
/nfs/scratch/fynu/elfaham/4tops_dir_dim62f/dim62f/sm_dim62f_ctZ/SubProcesses/P0_gg_tttxtx/born_G25/log.txt
/nfs/scratch/fynu/elfaham/4tops_dir_dim62f/dim62f/sm_dim62f_ctZ/SubProcesses/P0_bbx_tttxtx/born_G24/log.txt
/nfs/scratch/fynu/elfaham/4tops_dir_dim62f/dim62f/sm_dim62f_ctZ/SubProcesses/P0_bbx_tttxtx/born_G25/log.txt
/nfs/scratch/fynu/elfaham/4tops_dir_dim62f/dim62f/sm_dim62f_ctZ/SubProcesses/P0_bbx_tttxtx/born_G26/log.txt
/nfs/scratch/fynu/elfaham/4tops_dir_dim62f/dim62f/sm_dim62f_ctZ/SubProcesses/P0_bbx_tttxtx/born_G27/log.txt
/nfs/scratch/fynu/elfaham/4tops_dir_dim62f/dim62f/sm_dim62f_ctZ/SubProcesses/P0_bbx_tttxtx/born_G28/log.txt
/nfs/scratch/fynu/elfaham/4tops_dir_dim62f/dim62f/sm_dim62f_ctZ/SubProcesses/P0_bbx_tttxtx/born_G29/log.txt
/nfs/scratch/fynu/elfaham/4tops_dir_dim62f/dim62f/sm_dim62f_ctZ/SubProcesses/P0_bxb_tttxtx/born_G24/log.txt
/nfs/scratch/fynu/elfaham/4tops_dir_dim62f/dim62f/sm_dim62f_ctZ/SubProcesses/P0_bxb_tttxtx/born_G25/log.txt
/nfs/scratch/fynu/elfaham/4tops_dir_dim62f/dim62f/sm_dim62f_ctZ/SubProcesses/P0_bxb_tttxtx/born_G26/log.txt
/nfs/scratch/fynu/elfaham/4tops_dir_dim62f/dim62f/sm_dim62f_ctZ/SubProcesses/P0_bxb_tttxtx/born_G27/log.txt
/nfs/scratch/fynu/elfaham/4tops_dir_dim62f/dim62f/sm_dim62f_ctZ/SubProcesses/P0_bxb_tttxtx/born_G28/log.txt
/nfs/scratch/fynu/elfaham/4tops_dir_dim62f/dim62f/sm_dim62f_ctZ/SubProcesses/P0_bxb_tttxtx/born_G29/log.txt
Value of current Options:
              text_editor       :       None
      notification_center       :       True
       cluster_local_path       :       /cvmfs/cp3.uclouvain.be/madgraph/
    cluster_status_update       :       (900, 60)
               hepmc_path       :       None
          pythia-pgs_path       :       None
              thepeg_path       :       None
        madanalysis5_path       :       None
 acknowledged_v3.1_syntax       :       True
                 run_mode       :       1
        cluster_temp_path       :       None
            cluster_queue       :       None
         madanalysis_path       :       None
                   lhapdf       :       lhapdf-config
            f2py_compiler       :       None
                    ninja       :       /home/users/e/l/elfaham/pheno_work/working_dir/MG5_aMC_v3_3_1/HEPTools/lib
   automatic_html_opening       :       False
       cluster_retry_wait       :       300
      exrootanalysis_path       :       None
                  timeout       :       60
                  nb_core       :       5
        f2py_compiler_py2       :       None
        f2py_compiler_py3       :       None
         fortran_compiler       :       None
                  collier       :       /home/users/e/l/elfaham/pheno_work/working_dir/MG5_aMC_v3_3_1/HEPTools/lib
             pythia8_path       :       None
                hwpp_path       :       None
                  td_path       :       None
             delphes_path       :       None
              auto_update       :       7
             cluster_type       :       slurm
               eps_viewer       :       None
              web_browser       :       None
             cluster_size       :       150
           cluster_memory       :       None
             stdout_level       :       None
               lhapdf_py3       :       lhapdf-config
               lhapdf_py2       :       lhapdf-config
             cluster_time       :       None
         cluster_nb_retry       :       1
                 mg5_path       :       /home/users/e/l/elfaham/pheno_work/working_dir/MG5_aMC_v3_3_1
             syscalc_path       :       None
             cpp_compiler       :       None

I checked the log files, this is how they end:
 getting user params
 Number of phase-space points per iteration:          -1
 Maximum number of iterations is:           6
 Desired accuracy is:   5.0000000000000003E-002
 Using adaptive grids:           2
 Using Multi-channel integration
 Do MC over helicities for the virtuals
 Number of channels to integrate together:          20
Time in seconds: 0


Thanks,
Hesham