I am getting this error when I try to access: " The Google Maps API server rejected your request. This could be because the API key used on this site was regi

I am getting this error when I try to access: " The Google Maps API server rejected your request. This could be because the API key used on this site was registered for a different web site. You can generate a new key for this web site at http://code.google.com/apis/maps/ http://code.google.com/apis/maps/. "