phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 145 Table './mediest_phpbb/phpbb_sessions' is marked as crashed and should be repaired

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('6e3235fbf0814a8fde7623704a9fd7bd', -1, 1409306879, 1409306879, '36cd6347', 2, 0, 0)

Line : 187
File : sessions.php