phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 145 Table './grantfi2_phpb1/phpbb_sessions' is marked as crashed and should be repaired

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('de87b642f8ddcc81207b15ddae1d7f56', -1, 1455202386, 1455202386, '36c4f4ce', 20, 0, 0)

Line : 187
File : sessions.php