FIFA 23 | I have an error in the squad file, what do I do?

"We determined that your squad file does not match your opponent's and have the game aborted to prevent an unfair encounter."

You don't just notice that you are affected by the message. Even before that, your player moves in the Loading screen automatically and you cannot control it yourself.

This is how you can solve the problem: From the FIFA Main Menu, click Customize > Profile > Delete. Select the Onliner squad here and delete this. After that, the error shouldn't appear again.