YAY! I solved the problem. Thanks to topcat24. Based on his suggestion, I first re-ran the following sql line after changing the configuration group id '28' to something else, for example '50'.

INSERT INTO configuration_group VALUES (28, 'Super Orders', 'Settings for Super Order features', 100, 1);

Then I changed the Super Order configuration id in the configuration table of the database (all 12 entries) to '50' using phpmyadmin.

I hope this is helpful for those who are struggling with the same problem. Good luck everyone. Thanks again.