phpBB : Critical Error

Error doing DB query userdata row fetch

DEBUG MODE

SQL Error : 144 Table './thedelbert_com_@002d_phpbb2/sessions' is marked as crashed and last (automatic?) repair failed

SELECT u.*, s.* FROM sessions s, users u WHERE s.session_id = '917b4585da534c074107be2e5dcfcc45' AND u.user_id = s.session_user_id

Line : 271
File : sessions.php