'Guests' role could not be loaded error from nopCommerce site

Auto-Install Applications > nopCommerce
If you're getting 'Guests' role could not be loaded error as below
Server Error in '/' Application.
'Guests' role could not be loaded
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

You can fix it by going to your nopCommerce site admin panel

Admin > Customers > Customer Roles >> Edit 'Guest' user to make the change.

You must have a Role with a "System name" of Guest.  You can "Name" the role anything you want, but it must have a System name of Guest.