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) VALUES ('0876436e03e42a23715979db6611c028', -1, 1284155483, 1284155483, '266bbf76', -4, 0)

Line : 158
File : sessions.php