Hi Alvaro,
did you install nsjabber module for aolserver? If so you have a file nsjabber.so in your aolserver dir (default: /usr/local/aolserver/bin)
try this command
# nm nsjabber.so|grep Module
and check if Ns_ModuleInit is part of the nsjabber.so file. The output could be something like this:
0001e860 T Ns_ModuleInit
00031cbc D Ns_ModuleVersion
I had difficulties installing nsjabber from tarballs in cvs. I had success using this file (it works only for aolserver4):
https://openacs.org/storage/file?file_id=187244&show_all_versions_p=f
i hope this helps is some way.
\Orzenil
