"[addresses] {"errors"=>{"0"=>{"errors"=>[], "field-errors"=>{"country"=>"Country \"X\" is not a valid choice."}}}}"
Written by Mohamed Akoojee
This error means that the country that you have in your source CRM doesn't exist in the list of countries accepted by Close.io. The safest way to go is to pass a 2-character country code. You can see the list here.