.AsmX page error

While running time i am getting error:

 

System.ServiceModel.EndpointNotFoundException

HResult=0x80131501

Message=There was no endpoint listening at http://localhost:59501/CalculatorWebService.asmx that could accept the message. This is often caused by an incorrect address or SOAP action. See InnerException, if present, for more details.

Source=mscorlib

StackTrace:

at System.Runtime.Remoting.Proxies.RealProxy.HandleReturnMessage(IMessage reqMsg, IMessage retMsg)

at System.Runtime.Remoting.Proxies.RealProxy.PrivateInvoke(MessageData& msgData, Int32 type)

at CalculatorWeApplication.CalculatorService.CalculatorWebServiceSoap.Add(Int32 FirstNumber, Int32 SecondNumber)

at CalculatorWeApplication.CalculatorService.CalculatorWebServiceSoapClient.Add(Int32 FirstNumber, Int32 SecondNumber) in C:\Users\cchan\source\repos\WebServicesDemo\CalculatorWeApplication\Connected Services\CalculatorService\Reference.cs:line 53

at CalculatorWeApplication.WebForm1.Button1_Click(Object sender, EventArgs e) in C:\Users\cchan\source\repos\WebServicesDemo\CalculatorWeApplication\WebForm1.aspx.cs:line 21

Inner Exception 1:

WebException: Unable to connect to the remote server

Inner Exception 2:

SocketException: No connection could be made because the target machine actively refused it 127.0.0.1:59501