Test Query Error

I keep getting: Read Operation failed, nbu status = 1, severity = 2. 

I get this on most test querys when trying to create a policy. Is this an error on my part, or something the matter with the server?

My query that I'm testing:

vmware:/?filter=Displayname IsSet  AND Template Equal TRUE

Search and can't find that error message. Also see this error in the logs/wingui folder.

NBU Master Server is 7.5.0.7, local disk storage... What other info do you need?

Thanks!