phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 144 Table './flacycl_bikeforum/phpbb_sessions' is marked as crashed and last (automatic?) repair failed

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('9d5254f83bfbec4fb9d393f0f04c1141', -1, 1474824058, 1474824058, '36c4df2a', 20, 0, 0)

Line : 187
File : sessions.php