Google Maps plugin for Joomla does not work anymore

I use the google maps plugin in a Joomla article since 3 years
It worked fine
Now you get this message when the special tag displays the map (the map just flashes for a second then the error comes) :
Google Maps ne s'est pas chargé correctement sur cette page. Pour plus d'informations techniques sur cette erreur, veuillez consulter la console JavaScript. (site www.cbwsl.be => Accès)
Error is : "Google Maps ne s'est pas chargé correctement sur cette page. Pour plus d'informations techniques sur cette erreur, veuillez consulter la console JavaScript."
Where can I find that Joomla console Javascript to guess what is now happening ?
Thanks
LVL 1
LeTayAsked:
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leakim971PluritechnicianCommented:
LeTayAuthor Commented:
Many thanks leakim971
I found these messages :

Module 'earth' not found
Google Maps API Error
Type Error : mapdiv is undefined

Now the question is : why is that API producing error now when it was not the case before (runs since middle 2015).
I didn't change anything (no upgrade etc...)
leakim971PluritechnicianCommented:
I see your API key is not valid anymore comme on peut le voir ici :
https://developers.google.com/maps/documentation/javascript/error-messages#deleted-api-project-map-error

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