WCF Service error: “This collection already contains an address with scheme http.”

"This collection already contains an address with scheme http. There can be at most one address per scheme in this collection." is a Windows Communication Foundation (WCF) error message indicating you are trying to add an already existing binding. By default the web service listens to all in IIS configured host headers. A host header is the website address, for example example.com and www.example.com. If this is not correctly added to the web.config file, the following error is thrown