WebServiceClientClass - could not be instantiated, or the WebServiceURL Location could not be determined

Hi,

I'm trying to establish a communication between my edge, which is in one server, with my HUB which is in another one. 
In EDGE, when the HS.Gateway.HSWS.WebServices component sends a message to the HUB component, it receives the following error: "Cannot invoke method RegisterGateway; WebServiceClientClass 'HS.Hub.HSWS.WebServicesClient' could not be instantiated, or the WebServiceURL Location could not be determined".
 

May someone help me?