(<0.41.0>:gen_mod:80) : ejabberd initialization was aborted because a module start

Check if you have another errors with more details:

=ERROR REPORT==== 25-Jun-2011::12:55:23 ===
C(<0.39.0>:gen_mod:75) : Problem starting the module mo_adhoc for host "localhost"  
 options: []
 error: undef

=ERROR REPORT==== 25-Jun-2011::12:55:23 ===
C(<0.39.0>:gen_mod:80) : ejabberd initialization was aborted because a module start failed.

Crash dump was written to: //var/log/ejabberd/erl_crash_20110625-125522.dump
Problem starting the module mo_adhoc for host "localhost"                                     
 options: []                                                                                  
 error: undef

Sorry, I Resolved!

I Recompiled with mod_muc, mod_irc, mod_pubsub!!

Now is worked!!