After clicking on Activity module- Site Admin/Plugin/ Activity Modules I get the following error and only the "Assignment" module listed and no other modules. I have installed more than instances of other standard modules on the moodle site. As per the below error I had deleted the mdl_certificate module and removed the blocks Please help!

Debug info: Table 'capella.mdl_certificate' doesn't exist
SELECT COUNT('x') FROM mdl_certificate WHERE course<>0
[array (
)]
Stack trace:
line 391 of \lib\dml\moodle_database.php: dml_read_exception thrown
line 769 of \lib\dml\mysqli_native_moodle_database.php: call to moodle_database->query_end()
line 1256 of \lib\dml\moodle_database.php: call to mysqli_native_moodle_database->get_records_sql()
line 1331 of \lib\dml\moodle_database.php: call to moodle_database->get_record_sql()
line 1502 of \lib\dml\moodle_database.php: call to moodle_database->get_field_sql()
line 1485 of \lib\dml\moodle_database.php: call to moodle_database->count_records_sql()
line 144 of \admin\modules.php: call to moodle_database->count_records_select()