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i have some toruble like

MyBB has experienced an internal SQL error and cannot continue.
MyBB SQL Error

MyBB has experienced an internal SQL error and cannot continue.

SQL Error:
1064 - You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ')' at line 1
Query:
SELECT COUNT(tid) AS newann FROM threads WHERE visible=1 AND dateline>'1311415875' AND fid IN (52,)

I just had the same problem,
I had changed my MySQL password earlier,
i changed it back and poof
it fixed