Error when importing the WSDL via Run WSDL to JS

I'm trying to import a SOAP WSDL given by a third party through the Run WSDL to JS utility. but I'm getting the below error;

WSDL2JS: parseWSDL failed!
Unable to open WSDL file C:\Users\Desktop\eBond\TREGateway.wsdl

could someone please help me what's wrong here?