File missing in HERWIG shower

I'm trying to generate a simple process at NLO with a shower. MadGraph complains about a missing file in the MCatNLO folder (events.hep.gz) and indeed the file doesn't seem to be there. This happens with HERWIG6 and PYTHIA6Q. I didn't change anything else in the run card. I edited the shower card to include z > e+ e- and z > mu+ mu- with no other changes. Here is the debug file:

launch auto
Traceback (most recent call last):
  File "/home/josef/Documents/MG5_aMC_v2_2_3/madgraph/interface/extended_cmd.py", line 879, in onecmd
    return self.onecmd_orig(line, **opt)
  File "/home/josef/Documents/MG5_aMC_v2_2_3/madgraph/interface/extended_cmd.py", line 872, in onecmd_orig
    return func(arg, **opt)
  File "/home/josef/Documents/MG5_aMC_v2_2_3/madgraph/interface/amcatnlo_run_interface.py", line 1206, in do_launch
    self.run_mcatnlo(evt_file)
  File "/home/josef/Documents/MG5_aMC_v2_2_3/madgraph/interface/amcatnlo_run_interface.py", line 2555, in run_mcatnlo
    files.mv(os.path.join(rundir, 'events.%s.gz' % ext), hep_file)
  File "/home/josef/Documents/MG5_aMC_v2_2_3/madgraph/iolibs/files.py", line 172, in mv
    shutil.move(path1, path2)
  File "/usr/lib/python2.7/shutil.py", line 302, in move
    copy2(src, real_dst)
  File "/usr/lib/python2.7/shutil.py", line 130, in copy2
    copyfile(src, dst)
  File "/usr/lib/python2.7/shutil.py", line 82, in copyfile
    with open(src, 'rb') as fsrc:
IOError: [Errno 2] No such file or directory: '/home/josef/Documents/MG5_aMC_v2_2_3/test_NLO_1/MCatNLO/RUN_HERWIG6_1/events.hep.gz'
Value of current Options:
              web_browser : None
              text_editor : None
        cluster_temp_path : None
       group_subprocesses : False
             syscalc_path : None
            cluster_queue : None
         madanalysis_path : None
                   lhapdf : lhapdf-config
ignore_six_quark_processes : False
                    pjfry : None
    loop_optimized_output : True
    cluster_status_update : (600, 30)
   automatic_html_opening : False
                    gauge : unitary
               hepmc_path : /home/josef/Documents/MG5_aMC_v2_2_3/HepMC-2.06.09
             pythia8_path : /home/josef/Documents/MG5_aMC_v2_2_3/pythia8210
                hwpp_path : None
                  amcfast : amcfast-config
       cluster_retry_wait : 300
      output_dependencies : external
          pythia-pgs_path : /home/josef/Documents/MG5_aMC_v2_2_3/pythia-pgs
                 mg5_path : /home/josef/Documents/MG5_aMC_v2_2_3
                  td_path : /home/josef/Documents/MG5_aMC_v2_2_3/td
             delphes_path : /home/josef/Documents/MG5_aMC_v2_2_3/Delphes
              thepeg_path : None
             cluster_type : condor
      exrootanalysis_path : /home/josef/Documents/MG5_aMC_v2_2_3/ExRootAnalysis
         fortran_compiler : None
                  nb_core : 4
                      OLP : MadLoop
              auto_update : 7
         cluster_nb_retry : 1
                 applgrid : applgrid-config
               eps_viewer : None
                  timeout : 60
                  fastjet : None
                    golem : None
      complex_mass_scheme : False
             cpp_compiler : None
             stdout_level : 20
                 run_mode : 2
#************************************************************
#* MadGraph5_aMC@NLO *
#* *
#* * * *
#* * * * * *
#* * * * * 5 * * * * *
#* * * * * *
#* * * *
#* *
#* *
#* VERSION 2.2.3 2015-02-10 *
#* *
#* The MadGraph5_aMC@NLO Development Team - Find us at *
#* https://server06.fynu.ucl.ac.be/projects/madgraph *
#* *
#************************************************************
#* *
#* Command File for MadGraph5_aMC@NLO *
#* *
#* run as ./bin/mg5_aMC filename *
#* *
#************************************************************
set group_subprocesses Auto
set ignore_six_quark_processes False
set loop_optimized_output True
set complex_mass_scheme False
import model sm
define p = g u c d s u~ c~ d~ s~
define j = g u c d s u~ c~ d~ s~
define l+ = e+ mu+
define l- = e- mu-
define vl = ve vm vt
define vl~ = ve~ vm~ vt~
define p = p b b~
define j = j b b~
import model loop_sm
import model Hefty_NLO
define p = p b b~
define j = j b b~
generate b b~ > x0 > z e+ e- /a XGLU=0 QED=3 QCD=1 QNP=1 [QCD]
output test_NLO_1
######################################################################
## Process generated with '-default' model restrictions ##
## 4F scheme (MB>0) ##
## no CP-odd Higgs ##
## ##
## NB: Please check that before generating this process, ##
## you have correctly set the content of the multiparticles ##
## 'p' (proton) and 'j' (jet) inside MG5_aMC, ##
## accordingly to the massless flavour scheme ##
## 4F: p, j = g d d~ u u~ s s~ c c~ ##
######################################################################

###################################
## INFORMATION FOR FRBLOCK
###################################
Block frblock
    1 1.000000e+03 # Lambda
    2 1.000000e+00 # cosa
    3 1.000000e+00 # kSM
    4 1.000000e+00 # kHtt
    6 1.000000e+00 # kHbb
    8 1.000000e+00 # kHll
   10 1.000000e+00 # kHaa
   12 1.000000e+00 # kHza
   14 1.000000e+00 # kHgg
   16 1.000000e+00 # kHzz
   18 1.000000e+00 # kHww
   20 0.000000e+00 # kHda
   21 0.000000e+00 # kHdz
   22 0.000000e+00 # kHdwR (real part of kHdw)
   23 0.000000e+00 # kHdwI (imaginary part of kHdw)
  100 1.000000e+00 # kHcc
  102 1.000000e+00 # kHuu
  104 1.000000e+00 # kHdd
  106 1.000000e+00 # kHss

###################################
### INFORMATION FOR LOOP
####################################
Block loop
  1 9.118800e+01 # MU_R

###################################
## INFORMATION FOR SMINPUTS
###################################
Block SMINPUTS
    1 1.325070e+02 # aEWM1
    2 1.166390e-05 # Gf
    3 1.180000e-01 # aS

###################################
## INFORMATION FOR MASS
###################################
Block MASS
    6 1.730000e+02 # MT
   15 1.777000e+00 # MTA
   23 9.118800e+01 # MZ
   25 1.250000e+02 # MX0
## Dependent parameters, given by model restrictions.
## Those values should be edited following the
## analytical expression. MG5 ignores those values
## but they are important for interfacing the output of MG5
## to external program such as Pythia.
   1 0.000000 # MD
   2 0.000000 # MU
   3 0.000000 # MS
   4 0.000000 # MC
   5 0.000000 # MB
  11 0.000000 # e- : 0.0
  12 0.000000 # ve : 0.0
  13 0.000000 # mu- : 0.0
  14 0.000000 # vm : 0.0
  16 0.000000 # vt : 0.0
  21 0.000000 # g : 0.0
  22 0.000000 # a : 0.0
  24 80.419002 # w+ : cmath.sqrt(MZ__exp__2/2. + cmath.sqrt(MZ__exp__4/4. - (aEW*cmath.pi*MZ__exp__2)/(Gf*sqrt__2)))
  82 0.000000 # gh : 0.0

###################################
## INFORMATION FOR YUKAWA
###################################
Block YUKAWA
    1 4.800000e-03 # ymd
    2 2.300000e-03 # ymu
    3 95.00000e-03 # yms
    4 1.275000e+00 # ymc
    5 4.20000e+00 # ymb
    6 164.500e+00 # ymt
   11 0.000000e+00 # yme
   13 0.000000e+00 # ymmuon
   15 1.777000e+00 # ymtau

###################################
## INFORMATION FOR DECAY
###################################
DECAY 6 1.491500e+00 # WT
DECAY 23 2.441404e+00 # WZ
DECAY 24 2.047600e+00 # WW
DECAY 25 4.070000e-03 # WX0
## Dependent parameters, given by model restrictions.
## Those values should be edited following the
## analytical expression. MG5 ignores those values
## but they are important for interfacing the output of MG5
## to external program such as Pythia.
DECAY 1 0.000000 # d : 0.0
DECAY 2 0.000000 # u : 0.0
DECAY 3 0.000000 # s : 0.0
DECAY 4 0.000000 # c : 0.0
DECAY 5 0.000000 # b : 0.0
DECAY 11 0.000000 # e- : 0.0
DECAY 12 0.000000 # ve : 0.0
DECAY 13 0.000000 # mu- : 0.0
DECAY 14 0.000000 # vm : 0.0
DECAY 15 0.000000 # ta- : 0.0
DECAY 16 0.000000 # vt : 0.0
DECAY 21 0.000000 # g : 0.0
DECAY 22 0.000000 # a : 0.0
DECAY 82 0.000000 # gh : 0.0
#===========================================================
# QUANTUM NUMBERS OF NEW STATE(S) (NON SM PDG CODE)
#===========================================================

Block QNUMBERS 82 # gh
        1 0 # 3 times electric charge
        2 1 # number of spin states (2S+1)
        3 8 # colour rep (1: singlet, 3: triplet, 8: octet)
        4 1 # Particle/Antiparticle distinction (0=own anti)
#***********************************************************************
# MadGraph5_aMC@NLO *
# *
# run_card.dat aMC@NLO *
# *
# This file is used to set the parameters of the run. *
# *
# Some notation/conventions: *
# *
# Lines starting with a hash (#) are info or comments *
# *
# mind the format: value = variable ! comment *
#***********************************************************************
#
#*******************
# Running parameters
#*******************
#
#***********************************************************************
# Tag name for the run (one word) *
#***********************************************************************
  tag_1 = run_tag ! name of the run
#***********************************************************************
# Number of LHE events (and their normalization) and the required *
# (relative) accuracy on the Xsec. *
# These values are ignored for fixed order runs *
#***********************************************************************
 10000 = nevents ! Number of unweighted events requested
    -1 = req_acc ! Required accuracy (-1=auto determined from nevents)
    -1 = nevt_job! Max number of events per job in event generation.
                 ! (-1= no split).
#***********************************************************************
# Normalize the weights of LHE events such that they sum or average to *
# the total cross section *
#***********************************************************************
 average = event_norm ! average or sum
#***********************************************************************
# Number of points per itegration channel (ignored for aMC@NLO runs) *
#***********************************************************************
 0.01 = req_acc_FO ! Required accuracy (-1=ignored, and use the
                     ! number of points and iter. below)
# These numbers are ignored except if req_acc_FO is equal to -1
 5000 = npoints_FO_grid ! number of points to setup grids
 4 = niters_FO_grid ! number of iter. to setup grids
 10000 = npoints_FO ! number of points to compute Xsec
 6 = niters_FO ! number of iter. to compute Xsec
#***********************************************************************
# Random number seed *
#***********************************************************************
     0 = iseed ! rnd seed (0=assigned automatically=default))
#***********************************************************************
# Collider type and energy *
#***********************************************************************
    1 = lpp1 ! beam 1 type (0 = no PDF)
    1 = lpp2 ! beam 2 type (0 = no PDF)
 6500 = ebeam1 ! beam 1 energy in GeV
 6500 = ebeam2 ! beam 2 energy in GeV
#***********************************************************************
# PDF choice: this automatically fixes also alpha_s(MZ) and its evol. *
#***********************************************************************
 nn23nlo = pdlabel ! PDF set
 244600 = lhaid ! if pdlabel=lhapdf, this is the lhapdf number
#***********************************************************************
# Include the NLO Monte Carlo subtr. terms for the following parton *
# shower (HERWIG6 | HERWIGPP | PYTHIA6Q | PYTHIA6PT | PYTHIA8) *
# WARNING: PYTHIA6PT works only for processes without FSR!!!! *
#***********************************************************************
  HERWIG6 = parton_shower
#***********************************************************************
# Renormalization and factorization scales *
# (Default functional form for the non-fixed scales is the sum of *
# the transverse masses of all final state particles and partons. This *
# can be changed in SubProcesses/set_scales.f) *
#***********************************************************************
 F = fixed_ren_scale ! if .true. use fixed ren scale
 F = fixed_fac_scale ! if .true. use fixed fac scale
 91.188 = muR_ref_fixed ! fixed ren reference scale
 91.188 = muF1_ref_fixed ! fixed fact reference scale for pdf1
 91.188 = muF2_ref_fixed ! fixed fact reference scale for pdf2
#***********************************************************************
# Renormalization and factorization scales (advanced and NLO options) *
#***********************************************************************
 F = fixed_QES_scale ! if .true. use fixed Ellis-Sexton scale
 91.188 = QES_ref_fixed ! fixed Ellis-Sexton reference scale
 1 = muR_over_ref ! ratio of current muR over reference muR
 1 = muF1_over_ref ! ratio of current muF1 over reference muF1
 1 = muF2_over_ref ! ratio of current muF2 over reference muF2
 1 = QES_over_ref ! ratio of current QES over reference QES
#***********************************************************************
# Reweight flags to get scale dependence and PDF uncertainty *
# For scale dependence: factor rw_scale_up/down around central scale *
# For PDF uncertainty: use LHAPDF with supported set *
#***********************************************************************
 .true. = reweight_scale ! reweight to get scale dependence
  0.5 = rw_Rscale_down ! lower bound for ren scale variations
  2.0 = rw_Rscale_up ! upper bound for ren scale variations
  0.5 = rw_Fscale_down ! lower bound for fact scale variations
  2.0 = rw_Fscale_up ! upper bound for fact scale variations
 .false. = reweight_PDF ! reweight to get PDF uncertainty
 244601 = PDF_set_min ! First of the error PDF sets
 244700 = PDF_set_max ! Last of the error PDF sets
#***********************************************************************
# Merging - WARNING! Applies merging only at the hard-event level. *
# After showering an MLM-type merging should be applied as well. *
# See http://amcatnlo.cern.ch/FxFx_merging.htm for more details. *
#***********************************************************************
 0 = ickkw ! 0 no merging, 3 FxFx merging, 4 UNLOPS
#***********************************************************************
#
#***********************************************************************
# BW cutoff (M+/-bwcutoff*Gamma) *
#***********************************************************************
 15 = bwcutoff
#***********************************************************************
# Cuts on the jets *
# Jet clustering is performed by FastJet.
# When matching to a parton shower, these generation cuts should be *
# considerably softer than the analysis cuts. *
# (more specific cuts can be specified in SubProcesses/cuts.f) *
#***********************************************************************
   1 = jetalgo ! FastJet jet algorithm (1=kT, 0=C/A, -1=anti-kT)
 0.7 = jetradius ! The radius parameter for the jet algorithm
  10 = ptj ! Min jet transverse momentum
  -1 = etaj ! Max jet abs(pseudo-rap) (a value .lt.0 means no cut)
#***********************************************************************
# Cuts on the charged leptons (e+, e-, mu+, mu-, tau+ and tau-) *
# (more specific gen cuts can be specified in SubProcesses/cuts.f) *
#***********************************************************************
   0 = ptl ! Min lepton transverse momentum
  -1 = etal ! Max lepton abs(pseudo-rap) (a value .lt.0 means no cut)
   0 = drll ! Min distance between opposite sign lepton pairs
   0 = drll_sf ! Min distance between opp. sign same-flavor lepton pairs
   0 = mll ! Min inv. mass of all opposite sign lepton pairs
  30 = mll_sf ! Min inv. mass of all opp. sign same-flavor lepton pairs
#***********************************************************************
# Photon-isolation cuts, according to hep-ph/9801442 *
# When ptgmin=0, all the other parameters are ignored *
#***********************************************************************
  20 = ptgmin ! Min photon transverse momentum
  -1 = etagamma ! Max photon abs(pseudo-rap)
 0.4 = R0gamma ! Radius of isolation code
 1.0 = xn ! n parameter of eq.(3.4) in hep-ph/9801442
 1.0 = epsgamma ! epsilon_gamma parameter of eq.(3.4) in hep-ph/9801442
 .true. = isoEM ! isolate photons from EM energy (photons and leptons)
#***********************************************************************
# Maximal PDG code for quark to be considered a jet when applying cuts.*
# At least all massless quarks of the model should be included here. *
#***********************************************************************
 4 = maxjetflavor
#***********************************************************************
# For aMCfast+APPLGRID use in PDF fitting (http://amcfast.hepforge.org)*
#***********************************************************************
 0 = iappl ! aMCfast switch (0=OFF, 1=prepare APPLgrids, 2=fill grids)
#***********************************************************************