MyBB Community Forums

Could someone help me fix this error:

MyBB has experienced an internal SQL error and cannot continue.

SQL Error: 
1194 - Table 'f' is marked as crashed and should be repaired 
Query: 
SELECT f.*, fr.dateline AS lastread FROM mybb_forums f LEFT JOIN mybb_forumsread fr ON (fr.fid=f.fid AND fr.uid='1') WHERE f.active != 0 ORDER BY pid, disporder 

Thanks

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Also what does it mean when a user is Changing DST Switch

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New error hurry I need help bad!!!

MyBB has experienced an internal error and cannot continue.

Error Type:
MyBB Error (44)
Error Message:
MyBB was unable to load the SQL extension. Please contact the MyBB Group for support. MyBB Website

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Trying to bump this!

The first one means a table has crashed and needs to be repaired. Run this in phpMyAdmin:

REPAIR TABLE `f`;

Changing DST Switch means they're changing the daylight saving time setting in their User CP.

The last one means the database type is incorrect in ./inc/config.php.

It's not actually a table called f, it's the forums table.