2009.3 mysql error

[xmanhattan]

I looked this up on mysql and it notes a server error but I thought to ask if anyone has seen this.

mysql Σφάλμα [1032] : EXECUTE
URI: index.php
Message: Can't find record in 'sch_session'
SELECT session_id FROM sch_session WHERE session_id='a455b69e8f10712f4a1d0dd7203dc008'
DB function failed with error number 1032
Can't find record in 'sch_session'
SQL =

SELECT session_id FROM sch_session WHERE session_id='a455b69e8f10712f4a1d0dd7203dc008'

Everything was working fairly normal until this happened.
If you have and you know a fix, please advise.

Thanks