Cannot use an Empty URI to refer to the document Base URI since there is no in-scope Base URI!

I'm running 5.0 RC1:

Jazz Foundation - Core Libraries 5.0 RC1 RJF-I20140418-2156

Rational Requirements Composer 5.0 RC1 RMS5.0-I20140422_0022

Requirements Management - Core Libraries 5.0.0 RC1 5.0.0 RC1

I use the OSLC.NET library to help integrate my application with requirements management.

When I called the "LookupServiceProviderUrl" method on the OslcClient object I get this exception:

"Cannot use an Empty URI to refer to the document Base URI since there is no in-scope Base URI!"

I compared the RDF XML returned from this version of RM -vs- the 4.x version and there is a difference in the <oslc:ServiceProviderCatalog> node. In 4.x the rdf:about attribute is NOT empty. In 5.x it is empty. Is this the source of the exception?

Suggestions welcomed.