Using the SavePlace() function results in this error: HTTP 403 (HTTP/1.1 403 Forbidden). Help?

http://wiki.roblox.com/index.php?title=API:Class/DataModel/SavePlace

So i enabled "Allow this place to be updated using the Save Place API in your game." in the configuration page.

Then, using the dev console, I ran this:

game:SavePlace()

But then I get an error saying this:

HTTP 403 (HTTP/1.1 403 Forbidden)

Does this SavePlace function work at all? Am I doing something wrong? (Yes, I have HttpEnabled on. This is my own place.)