Exception on querying a particular table

cjstevenson
edited August 2012 in General
I have a Entity Framework Custom Assembly Connection that is failing on querying on a particular table (but works on other tables with the same connection).

The query (simply listing the ObjectSet) throws an ArgumentException:
The specified named connection is either not found in the configuration, not intended to be used with the EntityClient provider, or not valid.

Does anyone know what's going on?