[Rivet] The rivet Python module could not be loaded?

[Andy Buckley]

Hi Cheng,

The versions you are building are fine, but I see a reference to 
rivet/1.5.0 in your PYTHONPATH! My guess is that the Python interface is 
accidentally loading an old build of Rivet, which was made for a 
different architecture/GCC version... hence the GLIBCXX error.

Andy



On 24/01/17 10:24, Cheng Chen wrote:
> Hello all,
>
> I followed the prescription
> in https://rivet.hepforge.org/trac/wiki/GettingStarted to install the
> rivet in my lxplus session, however there is an error shows it cannot
> import the module correctly:
>
>     [chenc at lxplus0107 rivet]$ rivet --help
>     The rivet Python module could not be loaded: is your PYTHONPATH set
>     correctly?
>
>
> Then I tried to "import rivet” directly on python, this shows a ImportError:
>
>
>     >>> import rivet
>     Traceback (most recent call last):
>       File "<stdin>", line 1, in <module>
>       File
>     "/afs/cern.ch/user/c/chenc/software/rivet/lib/python2.7/site-packages/rivet/__init__.py",
>     line 12, in <module>
>         from rivet.core import *
>     ImportError: /usr/lib64/libstdc++.so.6: version `GLIBCXX_3.4.20' not
>     found (required by
>     /cvmfs/sft.cern.ch/lcg/releases/LCG_85/HepMC/2.06.09/x86_64-slc6-gcc49-opt/lib/libHepMC.so.4)
>
>
>
> And I listed my PATH info below:
>
>     [chenc at lxplus0107 rivet]$ echo $PYTHONPATH
>     /afs/cern.ch/user/c/chenc/software/rivet/lib/python2.7/site-packages:/afs/cern.ch/user/c/chenc/software/rivet/lib/python2.7/site-packages:/afs/cern.ch/sw/lcg/external/MCGenerators/agile/1.2.0/i686-slc5-gcc43-opt/lib/python2.5/site-packages:/afs/cern.ch/sw/lcg/external/MCGenerators/rivet/1.5.0/i686-slc5-gcc43-opt/lib/python2.6/site-packages:/afs/cern.ch/sw/lcg/external/MCGenerators/agile/1.2.0/i686-slc5-gcc43-opt/lib/python2.5/site-packages:/afs/cern.ch/sw/lcg/external/MCGenerators/rivet/1.5.0/i686-slc5-gcc43-opt/lib/python2.6/site-packages:/afs/cern.ch/sw/lcg/external/MCGenerators/rivet/1.5.0/i686-slc5-gcc43-opt/lib/python2.6/site-packages:
>
>
> Could help me to found where the problem come from?
> BTW, I installed with the RIVET_VERSION=2.5.3 and YODA_VERSION=1.6.6. Is
> it possible the problem is related to the version I installed?
>
> Thanks for your help
> Cheng
>
>
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>


-- 
Dr Andy Buckley, Lecturer / Royal Society University Research Fellow
Particle Physics Expt Group, University of Glasgow