MyBB SQL Error

MyBB has experienced an internal SQL error and cannot continue.

SQL Error:
144 - Table './noob_mybb/mybb_mailerrors' is marked as crashed and last (automatic?) repair failed
Query:
INSERT INTO mybb_mailerrors (`subject`,`message`,`toaddress`,`fromaddress`,`dateline`,`error`,`smtperror`,`smtpcode`) VALUES ('New Thread in Guides and Walkthroughs','Ascxlex,\n\nWekMoose has just started a new thread in Guides and Walkthroughs. This is a forum you have subscribed to at Forums.\n\nThe thread is titled Free Download And Software program Opinions\n\nHere is an excerpt of the message:\n--\nITunes 9.1 and forward modified the best way it handles track conversions. Converting a tune from AA... (visit the thread to read more..)\n--\n\nTo view the thread, you can go to the following URL:\nhttp://friendlyfire.org.uk/forum/showthread.php?tid=441184\n\nThere may also be other new threads and replies but you will not receive anymore notifications until you visit the board again.\n\nThank you,\nForums Staff\n\n------------------------------------------\nUnsubscription Information:\n\nIf you would not like to receive any more notifications of new threads in this forum, visit the following URL in your browser:\nhttp://friendlyfire.org.uk/forum/usercp2.php?action=removesubscription&type=forum&fid=2&my_post_key=9e71477ef16d2a398a3fa33c0fe5221c\n\n------------------------------------------','y0dbgd4xcrvi@gmx.com','\"Forums\" <andy@phlipside.co.uk>','1534802297','MyBB was unable to send the email using the PHP mail() function.','','0')