The way I achieved this is by hosting a html script (attached) with my google API key embedded. I then created a web page container onto the dashboard.I then created a dashboard action which passes the Latitude and Longitude values from the dashboard to the html.
That works for a couple of seconds (i see the corresponding streetview as per the location selected on the map) however it then throws that error and the image disappears.
Any ideas what could be the problem?
Does this fail if you used the same URL that you are constructing a bringin it up in a normal browser? Does any error occur then?