This moodle is used as a VLE at a school. All of the work that has been uploaded cannot be accessed by myself. I get the same 'Error Reading from Database' message each time I try.

Debug info: Unknown column 'status' in 'order clause'
SELECT u.id,u.picture,u.firstname,u.lastname,u.imagealt,u.email,
s.id AS submissionid, s.grade, s.submissioncomment,
s.timemodified, s.timemarked FROM mdl_user u LEFT JOIN mdl_assignment_submissions s ON u.id = s.userid
AND s.assignment = 1 WHERE u.id IN (84,103,78,88,105,71,70,74,73,75,85,110,109,99,95,100,112,113) ORDER BY status ASC, lastname ASC
[array (
)]
Stack trace:
line 394 of /lib/dml/moodle_database.php: dml_read_exception thrown
line 794 of /lib/dml/mysqli_native_moodle_database.php: call to moodle_database->query_end()
line 1321 of /mod/assignment/lib.php: call to mysqli_native_moodle_database->get_records_sql()
line 645 of /mod/assignment/lib.php: call to assignment_base->display_submissions()
line 369 of /mod/assignment/type/upload/assignment.class.php: call to assignment_base->submissions()
line 57 of /mod/assignment/submissions.php: call to assignment_upload->submissions()