Web Services name clash with AS top level class

Some context:

•     New to Flex
•     Using Flash Builder 4
•     Flex 4.1

I'm trying to connect to a web service and I get the following error:

An error occurred while attempting to resolve the existing model.

ERROR : ActionScript generation is not supported for entities whose names clash with this top level (no package) ActionScript classes.
Entity "Error" clashes with an AS top level class.

Any pointers on how to resolve conflicts with the WSDL object names and AS classes?

Thanks!