I am trying to migrate information from a project from an Essential database that I started to another one without information but with the same class structure as the OS Architecture, the project or database is in the following files

I am trying this migration with the XML Tab, first I get all the information from a database with information and I try to import it to the other but it shows me a coding error, when trying to code or correct the error that it shows me I achieve the import but information is lost and/or it disables or shows errors in the structure of the classes

First error

error when coding and achieving the import
Could you help me by telling me what I am doing wrong or how I can achieve this migration to have the information of instances and class structure in other project :