So the issue is the default definition of the order that MG5aMC is taking as default.
This force the loop induced mode (that you likely do not want) 
and then MG5aMC detects an inconsistency.


So the solution is likely to specify what you want.
My guess is that you want to do is:
> generate p p > xd xd~ j DMV<=2 [QCD]
(but obviously I can be wrong)

Cheers,

Olivier

> On 14 Mar 2023, at 15:17, Esteban Chalbaud <email address hidden> wrote:
> 
> Public bug reported:
> 
> Dear all I am having problems to run the following instructions in MadGraph:
> import model DMsimp_s_spin1
> define p = g u c d s b u~ c~ d~ s~ b~
> define j = g u c d s b u~ c~ d~ s~ b~
> define l+ = e+ mu+
> define l- = e- mu-
> define vl = ve vm vt
> define vl~ = ve~ vm~ vt~
> generate p p > xd xd~ j [QCD]
> 
> After I get:
> 
> INFO: Checking for minimal orders which gives processes. 
> INFO: Please specify coupling orders to bypass this step. 
> INFO: Trying coupling order WEIGHTED<=5: WEIGTHED IS 2*DMV+QCD+2*QED 
> Setting the born squared orders automatically in the process definition to QED^2<=4 QCD^2<=2 DMV=0.
> If this is not what you need, please regenerate with the correct orders.
> ---------------------------------------------------------------------------
> No Born diagrams found. Now switching to the loop-induced mode.        
> Please also cite ref. 'arXiv:1507.00020' when using results from this mode. 
> ---------------------------------------------------------------------------
> Command "generate p p > xd xd~ j [QCD]" interrupted with error:
> Exception : 
> Please report this bug on https://bugs.launchpad.net/mg5amcnlo
> More information is found in 'MG5_debug'.
> Please attach this file to your report.
> 
> 
> The report says:
> 
> 
> #************************************************************
> #*                     MadGraph5_aMC@NLO                    *
> #*                                                          *
> #*                *                       *                 *
> #*                  *        * *        *                   *
> #*                    * * * * 5 * * * *                     *
> #*                  *        * *        *                   *
> #*                *                       *                 *
> #*                                                          *
> #*                                                          *
> #*         VERSION 3.4.2                 2023-01-20         *
> #*                                                          *
> #*    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 low_mem_multicore_nlo_generation False
> set complex_mass_scheme False
> set include_lepton_initiated_processes False
> set gauge unitary
> set loop_optimized_output True
> set loop_color_flows False
> set max_npoint_for_channel 0
> set default_unset_couplings 99
> set max_t_for_channel 99
> set zerowidth_tchannel True
> set nlo_mixed_expansion True
> 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~
> import model DMsimp_s_spin1
> define p = 21 2 4 1 3 -2 -4 -1 -3 5 -5 # pass to 5 flavors
> define j = p
> generate p p > xd xd~ j [QCD]
> Traceback (most recent call last):
>  File "/lstore/titan/atlas/emogollon/MG5_aMC_v3_4_2/madgraph/fks/fks_base.py", line 173, in __init__
>    super(FKSMultiProcess, self).__init__(procdef, **options)
>  File "/lstore/titan/atlas/emogollon/MG5_aMC_v3_4_2/madgraph/core/diagram_generation.py", line 1611, in __init__
>    self.get('amplitudes')
>  File "/lstore/titan/atlas/emogollon/MG5_aMC_v3_4_2/madgraph/core/diagram_generation.py", line 1655, in get
>    diagram_filter=self['diagram_filter']))
>  File "/lstore/titan/atlas/emogollon/MG5_aMC_v3_4_2/madgraph/core/diagram_generation.py", line 1904, in generate_multi_amplitudes
>    process_definition.nice_string())
> madgraph.core.diagram_generation.NoDiagramException: No amplitudes generated from process Process: g/u/c/d/s/u~/c~/d~/s~/b/b~ g/u/c/d/s/u~/c~/d~/s~/b/b~ > xd xd~ g/u/c/d/s/b/u~/c~/d~/s~/b~ DMV=2 [ all = QED DMV QCD ] QED^2=4 QCD^2=4 DMV^2=0. Please enter a valid process
> 
> During handling of the above exception, another exception occurred:
> 
> Traceback (most recent call last):
>  File "/lstore/titan/atlas/emogollon/MG5_aMC_v3_4_2/madgraph/interface/master_interface.py", line 229, in do_add
>    return  self.cmd.do_add(self, line, *args, **opts)
>  File "/lstore/titan/atlas/emogollon/MG5_aMC_v3_4_2/madgraph/interface/amcatnlo_interface.py", line 667, in do_add
>    fksproc =fks_base.FKSMultiProcess(myprocdef,fks_options)
>  File "/lstore/titan/atlas/emogollon/MG5_aMC_v3_4_2/madgraph/fks/fks_base.py", line 182, in __init__
>    " For this, use the 'virt=' mode, without multiparticle labels.")
> madgraph.fks.fks_base.NoBornException: Born diagrams could not be generated for the process: g/u/c/d/s/u~/c~/d~/s~/b/b~ g/u/c/d/s/u~/c~/d~/s~/b/b~ > xd xd~ g/u/c/d/s/b/u~/c~/d~/s~/b~ DMV=2 [ all = QED DMV QCD ] QED^2=4 QCD^2=4 DMV^2=0. Notice that aMC@NLO does not handle loop-induced processes yet, but you can still use MadLoop if you want to only generate them. For this, use the 'virt=' mode, without multiparticle labels.
> 
> During handling of the above exception, another exception occurred:
> 
> Traceback (most recent call last):
>  File "/lstore/titan/atlas/emogollon/MG5_aMC_v3_4_2/madgraph/interface/extended_cmd.py", line 1544, in onecmd
>    return self.onecmd_orig(line, **opt)
>  File "/lstore/titan/atlas/emogollon/MG5_aMC_v3_4_2/madgraph/interface/extended_cmd.py", line 1493, in onecmd_orig
>    return func(arg, **opt)
>  File "/lstore/titan/atlas/emogollon/MG5_aMC_v3_4_2/madgraph/interface/master_interface.py", line 278, in do_generate
>    return self.cmd.do_generate(self, line, *args, **opts)
>  File "/lstore/titan/atlas/emogollon/MG5_aMC_v3_4_2/madgraph/interface/madgraph_interface.py", line 4712, in do_generate
>    self.do_add(" ".join(args))
>  File "/lstore/titan/atlas/emogollon/MG5_aMC_v3_4_2/madgraph/interface/master_interface.py", line 236, in do_add
>    return self.cmd.create_loop_induced(self, line, *args, **opts)
>  File "/lstore/titan/atlas/emogollon/MG5_aMC_v3_4_2/madgraph/interface/madgraph_interface.py", line 5290, in create_loop_induced
>    raise Exception
> Exception
>                          MadGraph5_aMC@NLO Options    
>                          ----------------    
>                auto_update 	:	7
>        complex_mass_scheme 	:	False
>    default_unset_couplings 	:	99
>                      gauge 	:	unitary
>         group_subprocesses 	:	Auto
>  ignore_six_quark_processes 	:	False
>  include_lepton_initiated_processes 	:	False
>           loop_color_flows 	:	False
>      loop_optimized_output 	:	True
>  low_mem_multicore_nlo_generation 	:	False
>     max_npoint_for_channel 	:	0
>          max_t_for_channel 	:	99
>        nlo_mixed_expansion 	:	True
>               stdout_level 	:	20 (user set)
>         zerowidth_tchannel 	:	True
> 
>                         MadEvent Options    
>                          ----------------    
>     automatic_html_opening 	:	True
>                    nb_core 	:	None
>        notification_center 	:	True
>                   run_mode 	:	2
> 
>                      Configuration Options    
>                      ---------------------    
>                        OLP 	:	MadLoop
>   acknowledged_v3.1_syntax 	:	False
>         auto_convert_model 	:	True (user set)
>         cluster_local_path 	:	None
>           cluster_nb_retry 	:	1
>              cluster_queue 	:	None (user set)
>         cluster_retry_wait 	:	300
>               cluster_size 	:	100
>      cluster_status_update 	:	(600, 30)
>          cluster_temp_path 	:	None
>               cluster_type 	:	condor
>                    collier 	:	./HEPTools/lib
>                contur_path 	:	./HEPTools/contur
>               cpp_compiler 	:	None
>             crash_on_error 	:	False
>               delphes_path 	:	./Delphes
>                 eps_viewer 	:	None
>        exrootanalysis_path 	:	./ExRootAnalysis
>              f2py_compiler 	:	None
>          f2py_compiler_py2 	:	None
>          f2py_compiler_py3 	:	None
>                    fastjet 	:	/lstore/titan/atlas/emogollon/MG5_aMC_v3_4_2/HEPTools/fastjet/bin/fastjet-config (user set)
>           fortran_compiler 	:	None
>                      golem 	:	None (user set)
>                 hepmc_path 	:	None (user set)
>                  hwpp_path 	:	None (user set)
>                     lhapdf 	:	lhapdf-config
>                 lhapdf_py2 	:	None
>                 lhapdf_py3 	:	/lstore/titan/atlas/emogollon/MG5_aMC_v3_4_2/HEPTools/lhapdf6_py3/bin/lhapdf-config (user set)
>          madanalysis5_path 	:	None (user set)
>           madanalysis_path 	:	./MadAnalysis
>  mg5amc_py8_interface_path 	:	/lstore/titan/atlas/emogollon/MG5_aMC_v3_4_2/HEPTools/MG5aMC_PY8_interface (user set)
>                      ninja 	:	./HEPTools/lib
>        output_dependencies 	:	external
>                   pineappl 	:	pineappl
>            pythia-pgs_path 	:	./pythia-pgs
>               pythia8_path 	:	/lstore/titan/atlas/emogollon/MG5_aMC_v3_4_2/HEPTools/pythia8 (user set)
>                 rivet_path 	:	./HEPTools/rivet
>                    samurai 	:	None
>               syscalc_path 	:	./SysCalc
>                    td_path 	:	./td
>                text_editor 	:	None
>                thepeg_path 	:	None (user set)
>                    timeout 	:	60
>                web_browser 	:	None
>                  yoda_path 	:	./HEPTools/yoda
> 
> 
> Any guesses why this is happening?
> Best,
> Esteban Chalbaud
> 
> ** Affects: mg5amcnlo
>     Importance: Undecided
>         Status: New
> 
> -- 
> You received this bug notification because you are subscribed to
> MadGraph5_aMC@NLO.
> https://bugs.launchpad.net/bugs/2011588
> 
> Title:
>  Not able to run NLO process in models in Madgraph 3.4.2
> 
> Status in MadGraph5_aMC@NLO:
>  New
> 
> Bug description:
>  Dear all I am having problems to run the following instructions in MadGraph:
>  import model DMsimp_s_spin1
>  define p = g u c d s b u~ c~ d~ s~ b~
>  define j = g u c d s b u~ c~ d~ s~ b~
>  define l+ = e+ mu+
>  define l- = e- mu-
>  define vl = ve vm vt
>  define vl~ = ve~ vm~ vt~
>  generate p p > xd xd~ j [QCD]
> 
>  After I get:
> 
>  INFO: Checking for minimal orders which gives processes. 
>  INFO: Please specify coupling orders to bypass this step. 
>  INFO: Trying coupling order WEIGHTED<=5: WEIGTHED IS 2*DMV+QCD+2*QED 
>  Setting the born squared orders automatically in the process definition to QED^2<=4 QCD^2<=2 DMV=0.
>  If this is not what you need, please regenerate with the correct orders.
>  ---------------------------------------------------------------------------
>   No Born diagrams found. Now switching to the loop-induced mode.        
>   Please also cite ref. 'arXiv:1507.00020' when using results from this mode. 
>  ---------------------------------------------------------------------------
>  Command "generate p p > xd xd~ j [QCD]" interrupted with error:
>  Exception : 
>  Please report this bug on https://bugs.launchpad.net/mg5amcnlo
>  More information is found in 'MG5_debug'.
>  Please attach this file to your report.
> 
> 
>  The report says:
> 
> 
> 
>  #************************************************************
>  #*                     MadGraph5_aMC@NLO                    *
>  #*                                                          *
>  #*                *                       *                 *
>  #*                  *        * *        *                   *
>  #*                    * * * * 5 * * * *                     *
>  #*                  *        * *        *                   *
>  #*                *                       *                 *
>  #*                                                          *
>  #*                                                          *
>  #*         VERSION 3.4.2                 2023-01-20         *
>  #*                                                          *
>  #*    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 low_mem_multicore_nlo_generation False
>  set complex_mass_scheme False
>  set include_lepton_initiated_processes False
>  set gauge unitary
>  set loop_optimized_output True
>  set loop_color_flows False
>  set max_npoint_for_channel 0
>  set default_unset_couplings 99
>  set max_t_for_channel 99
>  set zerowidth_tchannel True
>  set nlo_mixed_expansion True
>  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~
>  import model DMsimp_s_spin1
>  define p = 21 2 4 1 3 -2 -4 -1 -3 5 -5 # pass to 5 flavors
>  define j = p
>  generate p p > xd xd~ j [QCD]
>  Traceback (most recent call last):
>    File "/lstore/titan/atlas/emogollon/MG5_aMC_v3_4_2/madgraph/fks/fks_base.py", line 173, in __init__
>      super(FKSMultiProcess, self).__init__(procdef, **options)
>    File "/lstore/titan/atlas/emogollon/MG5_aMC_v3_4_2/madgraph/core/diagram_generation.py", line 1611, in __init__
>      self.get('amplitudes')
>    File "/lstore/titan/atlas/emogollon/MG5_aMC_v3_4_2/madgraph/core/diagram_generation.py", line 1655, in get
>      diagram_filter=self['diagram_filter']))
>    File "/lstore/titan/atlas/emogollon/MG5_aMC_v3_4_2/madgraph/core/diagram_generation.py", line 1904, in generate_multi_amplitudes
>      process_definition.nice_string())
>  madgraph.core.diagram_generation.NoDiagramException: No amplitudes generated from process Process: g/u/c/d/s/u~/c~/d~/s~/b/b~ g/u/c/d/s/u~/c~/d~/s~/b/b~ > xd xd~ g/u/c/d/s/b/u~/c~/d~/s~/b~ DMV=2 [ all = QED DMV QCD ] QED^2=4 QCD^2=4 DMV^2=0. Please enter a valid process
> 
>  During handling of the above exception, another exception occurred:
> 
>  Traceback (most recent call last):
>    File "/lstore/titan/atlas/emogollon/MG5_aMC_v3_4_2/madgraph/interface/master_interface.py", line 229, in do_add
>      return  self.cmd.do_add(self, line, *args, **opts)
>    File "/lstore/titan/atlas/emogollon/MG5_aMC_v3_4_2/madgraph/interface/amcatnlo_interface.py", line 667, in do_add
>      fksproc =fks_base.FKSMultiProcess(myprocdef,fks_options)
>    File "/lstore/titan/atlas/emogollon/MG5_aMC_v3_4_2/madgraph/fks/fks_base.py", line 182, in __init__
>      " For this, use the 'virt=' mode, without multiparticle labels.")
>  madgraph.fks.fks_base.NoBornException: Born diagrams could not be generated for the process: g/u/c/d/s/u~/c~/d~/s~/b/b~ g/u/c/d/s/u~/c~/d~/s~/b/b~ > xd xd~ g/u/c/d/s/b/u~/c~/d~/s~/b~ DMV=2 [ all = QED DMV QCD ] QED^2=4 QCD^2=4 DMV^2=0. Notice that aMC@NLO does not handle loop-induced processes yet, but you can still use MadLoop if you want to only generate them. For this, use the 'virt=' mode, without multiparticle labels.
> 
>  During handling of the above exception, another exception occurred:
> 
>  Traceback (most recent call last):
>    File "/lstore/titan/atlas/emogollon/MG5_aMC_v3_4_2/madgraph/interface/extended_cmd.py", line 1544, in onecmd
>      return self.onecmd_orig(line, **opt)
>    File "/lstore/titan/atlas/emogollon/MG5_aMC_v3_4_2/madgraph/interface/extended_cmd.py", line 1493, in onecmd_orig
>      return func(arg, **opt)
>    File "/lstore/titan/atlas/emogollon/MG5_aMC_v3_4_2/madgraph/interface/master_interface.py", line 278, in do_generate
>      return self.cmd.do_generate(self, line, *args, **opts)
>    File "/lstore/titan/atlas/emogollon/MG5_aMC_v3_4_2/madgraph/interface/madgraph_interface.py", line 4712, in do_generate
>      self.do_add(" ".join(args))
>    File "/lstore/titan/atlas/emogollon/MG5_aMC_v3_4_2/madgraph/interface/master_interface.py", line 236, in do_add
>      return self.cmd.create_loop_induced(self, line, *args, **opts)
>    File "/lstore/titan/atlas/emogollon/MG5_aMC_v3_4_2/madgraph/interface/madgraph_interface.py", line 5290, in create_loop_induced
>      raise Exception
>  Exception
>                            MadGraph5_aMC@NLO Options    
>                            ----------------    
>                  auto_update 	:	7
>          complex_mass_scheme 	:	False
>      default_unset_couplings 	:	99
>                        gauge 	:	unitary
>           group_subprocesses 	:	Auto
>    ignore_six_quark_processes 	:	False
>    include_lepton_initiated_processes 	:	False
>             loop_color_flows 	:	False
>        loop_optimized_output 	:	True
>    low_mem_multicore_nlo_generation 	:	False
>       max_npoint_for_channel 	:	0
>            max_t_for_channel 	:	99
>          nlo_mixed_expansion 	:	True
>                 stdout_level 	:	20 (user set)
>           zerowidth_tchannel 	:	True
> 
>                           MadEvent Options    
>                            ----------------    
>       automatic_html_opening 	:	True
>                      nb_core 	:	None
>          notification_center 	:	True
>                     run_mode 	:	2
> 
>                        Configuration Options    
>                        ---------------------    
>                          OLP 	:	MadLoop
>     acknowledged_v3.1_syntax 	:	False
>           auto_convert_model 	:	True (user set)
>           cluster_local_path 	:	None
>             cluster_nb_retry 	:	1
>                cluster_queue 	:	None (user set)
>           cluster_retry_wait 	:	300
>                 cluster_size 	:	100
>        cluster_status_update 	:	(600, 30)
>            cluster_temp_path 	:	None
>                 cluster_type 	:	condor
>                      collier 	:	./HEPTools/lib
>                  contur_path 	:	./HEPTools/contur
>                 cpp_compiler 	:	None
>               crash_on_error 	:	False
>                 delphes_path 	:	./Delphes
>                   eps_viewer 	:	None
>          exrootanalysis_path 	:	./ExRootAnalysis
>                f2py_compiler 	:	None
>            f2py_compiler_py2 	:	None
>            f2py_compiler_py3 	:	None
>                      fastjet 	:	/lstore/titan/atlas/emogollon/MG5_aMC_v3_4_2/HEPTools/fastjet/bin/fastjet-config (user set)
>             fortran_compiler 	:	None
>                        golem 	:	None (user set)
>                   hepmc_path 	:	None (user set)
>                    hwpp_path 	:	None (user set)
>                       lhapdf 	:	lhapdf-config
>                   lhapdf_py2 	:	None
>                   lhapdf_py3 	:	/lstore/titan/atlas/emogollon/MG5_aMC_v3_4_2/HEPTools/lhapdf6_py3/bin/lhapdf-config (user set)
>            madanalysis5_path 	:	None (user set)
>             madanalysis_path 	:	./MadAnalysis
>    mg5amc_py8_interface_path 	:	/lstore/titan/atlas/emogollon/MG5_aMC_v3_4_2/HEPTools/MG5aMC_PY8_interface (user set)
>                        ninja 	:	./HEPTools/lib
>          output_dependencies 	:	external
>                     pineappl 	:	pineappl
>              pythia-pgs_path 	:	./pythia-pgs
>                 pythia8_path 	:	/lstore/titan/atlas/emogollon/MG5_aMC_v3_4_2/HEPTools/pythia8 (user set)
>                   rivet_path 	:	./HEPTools/rivet
>                      samurai 	:	None
>                 syscalc_path 	:	./SysCalc
>                      td_path 	:	./td
>                  text_editor 	:	None
>                  thepeg_path 	:	None (user set)
>                      timeout 	:	60
>                  web_browser 	:	None
>                    yoda_path 	:	./HEPTools/yoda
> 
> 
>  Any guesses why this is happening?
>  Best,
>  Esteban Chalbaud
> 
> To manage notifications about this bug go to:
> https://bugs.launchpad.net/mg5amcnlo/+bug/2011588/+subscriptions
>