There are usually only three reasons for this. The key is wrong. You have copied & pasted the key wrong. There is some other coding issue.
Which one is impossible to guess from your post. Please post a link to your map, as requested in the posting guidelines: http://j.mp/postguide http://j.mp/includelink -- You received this message because you are subscribed to the Google Groups "Google Maps API" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/google-maps-api?hl=en.
