"launch ends with non zero status:1" when generating W+jets at NLO with high W pt

Hi,

I'm generating the following processes:

define p = p b b~
define j = j b b~

define ell+ = e+ mu+ ta+
define ell- = e- mu- ta-

generate p p > ell+ vl $$ t t~ h [QCD] @0
add process p p > ell+ vl j $$ t t~ h [QCD] @1

add process p p > ell- vl~ $$ t t~ h [QCD] @2
add process p p > ell- vl~ j $$ t t~ h [QCD] @3

and adding a cut on the W pt by adding the charged lepton and the neutrino. This works fine for my first three pt bins (100-250, 250-400, 400-650). However, when I try to generate the last bin, >650, I get the following error:

INFO: Result for check_poles:
INFO: Poles successfully cancel for 20 points over 20 (tolerance=1.0e-05)
INFO: Starting run
INFO: Using 8 cores
INFO: Cleaning previous results
INFO: Generating events without running the shower.
INFO: Setting up grid
INFO: Idle: 12, Running: 8, Completed: 0 [ current time: 20h49 ]
WARNING: program /afs/cern.ch/work/i/isdebruy/MonojetNLO/genproductions/bin/MadGraph5_aMCatNLO/wellnu01j_5f_NLO_FXFX_pT650ToInf/wellnu01j_5f_NLO_FXFX_pT650ToInf_gridpack/work/processtmp/SubProcesses/P0_cdx_epve/ajob1 2 F 0 launch ends with non zero status: 1. Stop all computation
/afs/cern.ch/work/i/isdebruy/MonojetNLO/genproductions/bin/MadGraph5_aMCatNLO/wellnu01j_5f_NLO_FXFX_pT650ToInf/wellnu01j_5f_NLO_FXFX_pT650ToInf_gridpack/work/processtmp/SubProcesses/P0_dxu_tapvt/ajob1: line 29: 1525 Terminated ../madevent_mintMC > log.txt < input_app.txt 2>&1
INFO: Idle: 12, Running: 7, Completed: 1 [ 1.6s ]
/afs/cern.ch/work/i/isdebruy/MonojetNLO/genproductions/bin/MadGraph5_aMCatNLO/wellnu01j_5f_NLO_FXFX_pT650ToInf/wellnu01j_5f_NLO_FXFX_pT650ToInf_gridpack/work/processtmp/SubProcesses/P0_ubx_epve/ajob1: line 29: 1540 Terminated ../madevent_mintMC > log.txt < input_app.txt 2>&1
date: write error: Broken pipe
INFO: Idle: 12, Running: 6, Completed: 2 [ 1.6s ]
/afs/cern.ch/work/i/isdebruy/MonojetNLO/genproductions/bin/MadGraph5_aMCatNLO/wellnu01j_5f_NLO_FXFX_pT650ToInf/wellnu01j_5f_NLO_FXFX_pT650ToInf_gridpack/work/processtmp/SubProcesses/P0_cbx_tapvt/ajob1: line 29: 1529 Terminated ../madevent_mintMC > log.txt < input_app.txt 2>&1
INFO: Idle: 12, Running: 5, Completed: 3 [ 1.7s ]
/afs/cern.ch/work/i/isdebruy/MonojetNLO/genproductions/bin/MadGraph5_aMCatNLO/wellnu01j_5f_NLO_FXFX_pT650ToInf/wellnu01j_5f_NLO_FXFX_pT650ToInf_gridpack/work/processtmp/SubProcesses/P0_cbx_epve/ajob1: line 29: 1527 Terminated ../madevent_mintMC > log.txt < input_app.txt 2>&1
date: write error: Broken pipe
INFO: Idle: 12, Running: 4, Completed: 4 [ 1.7s ]
/afs/cern.ch/work/i/isdebruy/MonojetNLO/genproductions/bin/MadGraph5_aMCatNLO/wellnu01j_5f_NLO_FXFX_pT650ToInf/wellnu01j_5f_NLO_FXFX_pT650ToInf_gridpack/work/processtmp/SubProcesses/P0_usx_tapvt/ajob1: line 29: 1532 Terminated ../madevent_mintMC > log.txt < input_app.txt 2>&1
date: write error: Broken pipe
INFO: Idle: 12, Running: 3, Completed: 5 [ 1.7s ]
/afs/cern.ch/work/i/isdebruy/MonojetNLO/genproductions/bin/MadGraph5_aMCatNLO/wellnu01j_5f_NLO_FXFX_pT650ToInf/wellnu01j_5f_NLO_FXFX_pT650ToInf_gridpack/work/processtmp/SubProcesses/P0_dxc_epve/ajob1: line 29: 1545 Terminated ../madevent_mintMC > log.txt < input_app.txt 2>&1
date: write error: Broken pipe
INFO: Idle: 12, Running: 2, Completed: 6 [ 1.8s ]
/afs/cern.ch/work/i/isdebruy/MonojetNLO/genproductions/bin/MadGraph5_aMCatNLO/wellnu01j_5f_NLO_FXFX_pT650ToInf/wellnu01j_5f_NLO_FXFX_pT650ToInf_gridpack/work/processtmp/SubProcesses/P0_sxu_epve/ajob1: line 29: 1536 Terminated ../madevent_mintMC > log.txt < input_app.txt 2>&1
date: write error: Broken pipe
INFO: Idle: 12, Running: 0, Completed: 8 [ 1.8s ]

Does anyone know what causes this? Thanks.

Cheers,
Isa