am getting the avove error while my 7961 boots..am using CME on 2801.
it goes thru and completed the registration anyway.
This question was nicely answered by Paul from Cisco Systems. Here is the clip;
The 'error loading locale' is normal as long as you are in the U.S. because it is looking for a tone file that doesn't exist because it is the default setting. You should be OK to ignore it because it won't affect anything.
Refer here for details on CME locale configuration -
From this recent thread;
Hope this helps!