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 ('248e0ef8d75094db6132f0a599ef1483', -1, 1406159480, 1406159480, '36e10146', 2, 0, 0)

Line : 187
File : sessions.php