symbol lookup error from ./Pythia8.exe

Hi,

It seems an issue of some dynamical library linking of pythia8 which are not correctly setup.
Did you change your version of gcc or something similar during/after some of the compilation?

Cheers,

Olivier

PS: Since this is a C++ issue and that language is not our expertise... might be better to ask your local IT expert.

> On 19 Jan 2021, at 21:05, Khawla Jaffel <email address hidden> wrote:
>
> New question #695097 on MadGraph5_aMC@NLO:
> https://answers.launchpad.net/mg5amcnlo/+question/695097
>
> Hello experts,
>
>
> I am running mg@NLO v2.7.3 with matching and FXFX jet merging (ickkw =3 ), showering with pythia8
>
> Everything running okay until this stage :
>
> INFO: MadSpin Done
> INFO: Preparing MCatNLO run
> INFO: Using LHAPDF v6.3.0 interface for PDFs
> INFO: Compiling MCatNLO for PYTHIA8...
> INFO: ... done
> INFO: Showering events...
> INFO: (Running in /nfs/user/kjaffel/MG5_aMC_v2_7_3/bbH2_4F-scheme_model_2hdmtII_NLO_prod_ver1/MCatNLO/RUN_PYTHIA8_6)
> INFO: Idle: 1, Running: 0, Completed: 0 [ current time: 20h44 ]
> mv: cannot stat ‘Pythia8.hep’: No such file or directory
> gzip: events.hepmc: No such file or directory
> INFO: Idle: 0, Running: 0, Completed: 1 [ 1.6s ]
> INFO: Idle: 0, Running: 0, Completed: 0 [ current time: 20h44 ]
> Command "launch auto --name run_tanbeta_1p5 -m" interrupted with error:
> IOError : [Errno 2] No such file or directory: '/nfs/user/kjaffel/MG5_aMC_v2_7_3/bbH2_4F-scheme_model_2hdmtII_NLO_prod_ver1/MCatNLO/RUN_PYTHIA8_6/events.hepmc.gz'
> Please report this bug on https://bugs.launchpad.net/mg5amcnlo
> More information is found in '/nfs/user/kjaffel/MG5_aMC_v2_7_3/bbH2_4F-scheme_model_2hdmtII_NLO_prod_ver1/run_tanbeta_1p5_decayed_4_tag_1_debug.log'.
> Please attach this file to your report.
> INFO: gzipping output file: events.lhe
> INFO:
>
>
> closer look to the log file :
>
> IOError: [Errno 2] No such file or directory: '/nfs/user/kjaffel/MG5_aMC_v2_7_3/bbH2_4F-scheme_model_2hdmtII_NLO_prod_ver1/MCatNLO/RUN_PYTHIA8_6/events.hepmc.gz'
> Related File: /nfs/user/kjaffel/MG5_aMC_v2_7_3/bbH2_4F-scheme_model_2hdmtII_NLO_prod_ver1/MCatNLO/RUN_PYTHIA8_6/events.hepmc.gz
>
> and the mcatnlo_run.log in RUN_PYTHIA8_6 giving me this error :
>
> ./Pythia8.exe: symbol lookup error: /nfs/user/kjaffel/MG5_aMC_v2_7_3/HEPTools/pythia8//lib/libpythia8lhapdf6.so: undefined symbol: _ZN6LHAPDF8findFileERKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEE
>
> Any idea ??
> Many thanks in advance ,
> Khawla
>
>
>
>
>
> --
> You received this question notification because you are an answer
> contact for MadGraph5_aMC@NLO.

Hi,

Indeed, what happened is that i changed the lhapdf after installing pythia8 with an old version !

ldd /HEPTools/pythia8//lib/libpythia8lhapdf6.so
show me which version of lhapdf pythia8 actually calling.

i reinstall pythia8 again with the new version and that solve my problem.

Thanks Olivier,