An entity of type service cannot be owned by a role, a group, or by principals mapped to certificates or asymmetric keys.

I'm using SQL Server 2008 R2 and a WCF service in Visual Studio 2010. I am trying to set up a SQL Dependency to detect changes in the database, and I have set up a queue and service. I keep getting the above error when running the service, though. 

I already have the service set to AUTHORIZATION [dbo], and I have tried logging in as a regular user (I usually log in as dbo) but so far nothing has worked. 

I have looked around a lot and have not been able to find anything helpful. Any help would be much appreciated!