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 ('fe6967691af33a7647e63b4321dade0b', -1, 1427835457, 1427835457, 'b8495aa7', 14, 0, 0)

Line : 187
File : sessions.php