Error reading ServiceProviderCatalog - may be related to 6.0.4 upgrade

Hi,
I am using a lyo based java code to read RTC data. It worked fine until now. Suddenly, I am getting an exception. The only change I can think of that could cause this is upgrading CLM to 6.0.4. Can anyone understand what could have happened?

The exception happens on this code:

String serviceProviderUrl = client.lookupServiceProviderUrl(catalogUrl, projectArea);

The error message is:

ERROR:A javax.ws.rs.ext.MessageBodyReader implementation was not found for class org.eclipse.lyo.oslc4j.core.model.ServiceProviderCatalog type and text/html; charset=UTF-8 media type.  Verify that all entity providers are correctly registered.  Add a custom javax.ws.rs.ext.MessageBodyReader provider to handle the type and media type if a JAX-RS entity provider does not currently exist.

Thanks!