Hi
I was facing a similar issue...
Have you tried
nlserver config -reload
If you are getting an error here (as we got), this may be the root cause of not being able to start the AC service.
Check if there is an existing 'diff' file in your conf folder.
Rename it (i.e. change the externsion to '.diff_old').
Re try the
nlserver config -reload
And try again to start the service.
It should work now (it worked for us).
Regards