Error while trying to Import a Csv Collection

I have a Collection of Cities which has a name property, Relation to the user (multiple users 1 city), Relation with the Province (Multiple Cities 1 province), and relation with the country ( Multiple Cities 1 Country). I am trying to Import a File with all of those cities. the Import only works if I Choose City name only but if I Choose to import the city name and which province & country each city is in the Import gives me Unknown error. (Using Google sheets to create the CSV file)

What can I do to fix this?