Import Purchase Orders Returns Error:PO_PDOI_SUPPLIER_CONTACT_VALID The supplier contact isn't valid

While Importing Purchase Order Received the errors for Supplier Contact as PO_PDOI_SUPPLIER_CONTACT_VALID The supplier contact isn't valid. Verify that the name of the supplier contact matches the name format in the Supplier portal. For example, the correct name format is Smith, John.

Checked all contact Full Name and entered in correct format mentioned as mentioned Smith, John and reloaded again received same error . FBDI File used for conversion attached and also error filed attached.

Again with some changes instead of Full name format as Smith, John. mentioned above we used the Party Name in format John Smith