“Error while running Changer: Server Subquery returned more than 1 value.  This is not permitted when the subquery follows =, !=, <, <-=, >, >= or when the subquery is used as an expression.”

This error would occur if one of the tables in the database has a database trigger. When the code (GL account/customer/vendor/item/employee) in the table is changed by Changer, this trigger is running and returning a data set. To resolve this error, the trigger should be temporarily disabled while running Changer.