phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1114 The table 'phpbb_sessions' is full

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('4e5bdb7eb7e6545b581e55c0dd112bc9', -1, 1475069764, 1475069764, '365bf3af', -1, 0, 0)

Line : 187
File : sessions.php