How to use swagger try it out - running locally

[nat2k5us]

The swagger (API) is using the same port as WeatherService
Microsoft.AspNetCore.Server.Kestrel[0]
Unable to start Kestrel.
System.IO.IOException: Failed to bind to address http://127.0.0.1:5102: address already in use.
---> Microsoft.AspNetCore.Connections.AddressInUseException: Address already in use
---> System.Net.Sockets.SocketException (48): Address already in use
at System.Net.Sockets.Socket.UpdateStatusAfterSocketErrorAndThrowException(SocketError error, String callerName)
at System.Net.Sockets.Socket.DoBind(EndPoint endPointSnapshot, SocketAddress socketAddress)

How to run it and use the try it out?