Server Stats is an experimental feature. That's the reason it is not linked anywhere on the Admin Dashboard.
It is only to be used by advanced users who can at least debug the error message.
Go to Admin > Settings > Development Mode and enable it.
Go to the Server Stats page and Go to the Chrome Developers Tool (or whatever it is called on your browser)
Go to the Network tab and see the response from the server.
If you do not get any message there also, try removing the try/catch block on the controller and check.
Again, it is only experimental, so self debugging is required.