IIS cannot be started. Another web site may be using the same port

Sometimes when you try to start a stopped website, you receive an error message telling you

"IIS cannot be started. Another web site may be using the same port"

This problem occurs when this websites http(or other protocol) have been declared with no value or duplicate value. To solve this problem just

Right click on the web site and then click on "Edit Bindings...".  If there are two binding to any port. Remove the one where the IP Address is empty.