phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 145 Table './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 ('174a72cf9306c7d4598f42b07cfcc182', -1, 1422738349, 1422738349, '36928f66', -1, 0, 0)

Line : 187
File : sessions.php