I receive the following error message when uploading products to Amazon in magnalister. How can
I resolve these issues?

Amazon API response: Feed rejected (Code: InvalidMarketplace, RequestId: ...)

or

Amazon : Could not upload file.
Amazon : Amazon API response: Invalid request parameters (mpID: xxxxx)
(Code: InvalidInput, RequestId: xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx)