Was getting this error with Spring that came down to the fact one Dll was out of date - the Dll was Risk.dll and the config file throwing the error was Risk.xml.config but this was clouded by another config file trying to set the same object also throwing the error.
I think Spring loaded the Risk.dll assembly and stored the bad/old reference e.g. IMyMovedObject as belonging to the old library so other objects which had reference to the same type also threw this error even though their build was up to date.
