The endpoints of the server instances you have specified have conflicting port numbers. Endpoints for instances on the same ...

The endpoints of the server instances you have specified have conflicting port numbers. Endpoints for instances on the same server must use different ports because ports are a server resource and cannot be shared between instances. The following instances are using the same port of the same server:  {0} If the endpoint(s) has not been created yet, change the port number(s) in the wizard. If endpoint(s) already exist, you must cancel the wizard and change the port number(s) manually.