I am trying to create a python-2.7.10 module on a CentOS 6 cluster. My simple python-2.7.10 module file is :

prepend-path PATH /gpfs0/export/opt/anaconda-2.3.0/bin 
prepend-path MANPATH /gpfs0/export/opt/anaconda-2.3.0/share
prepend-path LD_LIBRARY_PATH /gpfs0/export/opt/anaconda-2.3.0/lib
set-alias python /gpfs0/export/opt/anaconda-2.3.0/bin/python
set-alias python2.7 /gpfs0/export/opt/anaconda-2.3.0/bin/python

When I load the module, e.g.

module load python-2.7.10 

python2.7 works fine. However, if I try to module list or module avail or module unload python-2.7.10

I get the error

init.c(556):ERROR:161: Cannot initialize TCL

However, if I try my octave-4.0.0 module :

prepend-path PATH /gpfs0/export/opt/octave-4.0.0/bin 
prepend-path MANPATH /gpfs0/export/opt/octave-4.0.0/share
prepend-path LD_LIBRARY_PATH /gpfs0/export/opt/octave-4.0.0/lib
set-alias octave /gpfs0/export/opt/octave-4.0.0/bin/octave-4.0.0 
set-alias octave-gui /gpfs0/export/opt/octave-4.0.0/bin/octave-4.0.0 
set-alias octave-cli /gpfs0/export/opt/octave-4.0.0/bin/octave-cli-4.0.0

I can module list, module avail and module unload octave-4.0.0 just fine. Clearly, my python-2.7.10 module has broken something. How do I fix this?


2 Answers 2


Evidently, setting LD_LIBRARY_PATH is bad form as discussed here, here and here. So I changed my evil ways and did not set LD_LIBRARY_PATH and my problem was solved.

EDIT : It turns out that the root of this problem is a difference between the system /usr/lib64/libtcl8.5.so and anaconda's /gpfs0/export/opt/anaconda-2.3.0/lib/libtcl8.5.so. Anaconda's tcl library is incompatible with the Modules package. The solution stays the same, but if you need the anaconda libraries you need to handle those on a case by case basis.


I've encountered the same issue and, using the suggestion from the link below, I was able to correct the problem without unsetting LD_LIBRARY_PATH. Basically, you disable the modulecmd's ability to use LD_LIBRARY_PATH for its execution; however, this change does not prevent modulecmd from modifying the LD_LIBRARY_PATH variable. The commands used are: chown nobody:nobody modulecmd chmod ug+s modulecmd


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