I just want to know how can I display sales by country and inside this country, the sales by cities by the map widget which is present on the marketplace?
Seems that there should be a screenshot in your question, but there is none. And I assume that you receive "Selected address cannot be found due to the web mapping service error" error message and it is related to the fact that https://nominatim.openstreetmap.org service that is used in maps cannot find address you've specified (for example because of ZIP/Postal code). Please remove Postal code from your address and check the issue once again. Also please check if your address can be found in https://nominatim.openstreetmap.org.
I have the same problem with the addresses in Brazil, and it works fine when I remove the Zip/Postal code. Is there any setup for that, so that I can keep address with the ZIP/Postal code and prevent the OpenStreeMap service from using it for the search?