Hi, I am getting this error
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Check if primary key (usually "id" column) in corresponding table in database has the auto increment option active. If don't check the cdt structure and verify if the option "Automatically generates the following unique identifier when new records are written to a data store entity..." is checked.
Usually the most helpful part of these messages is in the details - specifically it says: "a different object with the same identifier value was already associated with the session". Is it possible that you have duplicate identifiers in your table or you have a mismatch between your CDT structure and your database structure?
If that's not the problem, I think we'll need a lot more information to help you. What is your data structure? What data are you trying to insert? What troubleshooting steps have you tried?