I received an error 'Tariff Treatment Invalid for Cntry of exp and/or Cntry of Orig', what does it mean?

I received an error 'Tariff Treatment Invalid for Cntry of exp and/or Cntry of Orig', what does it mean?

check APP ref number in responses and look for specific Line items that are rejected --> go to subheader and check invoices then go for Invoice references.