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 ('4b81213d87178e6f116aeba76016ab2b', -1, 1283990720, 1283990720, '266bbf58', -4, 0, 0)

Line : 189
File : sessions.php