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 ('8063e370f8dd4d018e3675a9142b4c87', -1, 1283534177, 1283534177, '266bbf6c', 0, 0, 0)

Line : 187
File : sessions.php