Hello,

I would like to use GAP from within Sage to do experiments with 
crystallographic groups. For this I installed the packages cryst, crystcat, 
carat, etc. in the Sage version of GAP.

When I start Sage and execute "gap_console()" and type

   LoadPackage("cryst");

everything works perfectly. But when I execute

   gap.LoadPackege('"cryst"')

from within Sage I get the strange error

  Warning: this should never happen

and Sage keeps running until I interrupt it with Ctrl-c. When I try to load 
another package like Alnuth, everything works fine:

  gap.LoadPackage('"alnuth"')

yields "true."

Any ideas of what could be wrong? I don't even know where to start looking for 
errors since the error message is not very helpful.

Thanks in advance,
Moritz

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