I found this to be an issue as well. They left out an entry for the Insert Into so I went to the original file for this contribution and used this sql code to get my information added and it worked like a charm. If you compare this info to the one included in new file you will see they left out the 1 and 2 before username:
INSERT INTO `administrator` VALUES (1, 'username1', password('your_password1'), NULL, NULL);
INSERT INTO `administrator` VALUES (2, 'username2', password('your_password2'), NULL, NULL);