Warning: Problem loading the .json data file for mapping

This post needs to be updated !!

If you are reading this post, you probably received the warning message below when opening the Mapping web app: 

What's a .json data file?

The .json data file is the map data file that the Mapping Sheets add-on creates in the xsMapping folder in your Google Drive. 

How do I solve this problem?

How do I know if I am logged into the Chrome browser with multiple Google accounts?

Open a new tab in your Chrome browser and click on the round picture or initial in the top-right corner. You will be able to see all the accounts that you are logged in with. If you are not logged in with your default account, the text "(default)" will appear next to your default account.