I'm getting the subject error whenever I try to retrieve data using any of my AF element properties. I tried different ways to get data but getting the same error. This is Excel 2013 running on Windows server 2008. I found one thread for the same error that linked that to not having an AF configured in Excel->PI Datalink->Settings->Connection Manager which is not true in my case. Appreciate any help.
From your screenshot it appears you have double backslashes before the AF Server name as well as the AF Database name. This is only required before a Server name and not a database name. (Either that or you may have accidentally put your server name into the path twice)