phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1195 Table '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 ('b26ddeb96cad8c2d0b60de41d56adc27', -1, 1283991268, 1283991268, '266bbf55', -9, 0, 0)

Line : 189
File : sessions.php