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 ('8cbdf81f00dc19d1b601648697fc8701', -1, 1455264181, 1455264181, '36930a0c', 26, 0, 0)

Line : 187
File : sessions.php