Fix for Default Country Code [or State Code] Not Valid

Default country code not valid: [name of the default country code that does not exist in the Country pick list in your Salesforce instance] - Please ensure default is spelled correctly and Metadata is up to date.

Default state code: [name of the default state code that does not exist in the State pick list in your Salesforce instance] - Please ensure default is spelled correctly and Metadata is up to date.