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 ('dc49787a763466b212c6de79dfbf851a', -1, 1438377954, 1438377954, '365b26dd', -1, 0, 0)

Line : 187
File : sessions.php