Found nothing to import in <wsdl file>

Hi,
I tried im porting a wsdl file into soapUI. It throws up an error saying "Found nothing to import in <wsdl file>".

Initially we had an Oracle BPEL webservice which had been deployed. From soapUI, this wsdl can be invoked. The Siebel team says, they need to have a WSDL file rather than the wsdl url to invoke the service. The Siebel team says that they face an error when they try to import the file. I tried importing the wsdl file in soapUI and it gives me this error.

I am unable to understand the cause for this issue. Can someone tell me why this is happening and what is the resolution to this, please?

Thanks,
Saptarshi