Error connecting extensions

I have completed a freepbx installation and all seems to be fine except for the fact that I cannot register any ip phones. I think it has something to do with the error below;

symlink from modules failed
Ignore this
retrieve_conf failed to sym link the /etc/asterisk/extensions.conf file from modules
Added 2 minutes ago
(retrieve_conf.SYMLINK)

Anybody know how to resolve ths error?

thanks

RM