Error: Could not find phrase 'OPM_Deny'

[Dark_D]

I have 3.5.3 and have found this error waiting for me today on every page:

Could not find phrase 'OPM_Deny'.

I can't log in to the admincp or for that matter even the forum.
All was good last night, this was the first time I had a chance to log in today.

Where did this come from and how can I correct it?

I found an email about a database error, do these 2 things co-inside?

Database error in vBulletin 3.5.3:

Invalid SQL:

REPLACE INTO datastore
(title, data)
VALUES
('eventcache', 'a:1:{s:4:\"date\";s:9:\"2-12-2006\";}');

MySQL Error : Deadlock found when trying to get lock; Try restarting transaction
Error Number : 1213
Date : Tuesday, February 7th 2006 @ 06:17:03 AM