I'm getting the above error.
When I click on JavaScript console, I get the following two messages::

you have included the Google Maps API multiple times on this page. This may cause unexpected errors
Google Maps API error: MissingKeyMapError

Here is what I found on another website:
I faced the same type of problem. This occurs if your web page including maps api more than one time.

I have checked in my case there was a .js file that was also calling maps api, so please first check if you are including maps api more than one time, if you are, remove the one.

Hey!

Thank you for letting us know about this issue!
Could you please check if another plugin or theme option is including Google Maps API on your website? It might require providing API key there as well.

Otherwise please give us temporary WordPress administrator access to your website, and we will check this problem for you. You can send the login credentials using the contact form on this page .

Also mention the link to this forum thread in your message.
Thanks! Have a wonderful day!