When Node Assassin is uninstalled, it will try to restore the 'cluster.ng' or
'cluster.rng' from the backup it made at install time. If you altered the file
after Node Assassin was installed, you have two options:

1. Skip the replacement during uninstall process and then manually remove the
   Node Assassin support.

2. Allow the original cluster.ng or cluster.rng to be restored and then
   re-apply your changes. This can be assisted by diff'ing the backup made by
   the uninstaller against the restored file.