c# - Interface and metadata errors in WCF service -

trying create first wcf service, 2 errors not allowing me go next level.

1) failed add service. service metadata may not accessible. make sure service running , exposing metadata.
2) error: cannot obtain metadata http://localhost:53238/smsgatewayportclient.svc if windows (r) communication foundation service have access, please check have enabled metadata publishing @ specified address. enabling metadata publishing, please refer client , service bindings may mismatched. remote server returned error: (415) cannot process message because content type 'application/soap+xml; charset=utf-8' not expected type 'text/xml; charset=utf-8'..http error uri: http://localhost:53238/smsgatewayportclient.svc html document not contain web service discovery information.

below class:

namespace wcfservice2 {      public class service1 : iservice1     {         public int add(int a, int b)         {             return + b;         }           sendmessageresponse1 sendmessage(sendmessagerequest request)         {             sendmessageresponse1 s = new sendmessageresponse1();             return s;         }     }  } 

below config :

<?xml version="1.0"?> <configuration>   <appsettings>     <add key="aspnet:usetaskfriendlysynchronizationcontext" value="true" />   </appsettings>   <system.web>     <compilation debug="true" targetframework="4.5" />     <httpruntime targetframework="4.5"/>   </system.web>   <system.servicemodel>     <services>       <service name="wcfservice2.service1" behaviorconfiguration="metadatabehavior">         <endpoint address="" binding="wshttpbinding" contract="wcfservice2.iservice1" />         <endpoint address="mex" binding="mexhttpbinding" contract="imetadataexchange" />       </service>     </services>     <behaviors>       <servicebehaviors>         <behavior name="metadatabehavior">           <servicedebug includeexceptiondetailinfaults="true" httphelppageenabled="true" />           <servicemetadata httpgetenabled="true"/>         </behavior>       </servicebehaviors>     </behaviors>     <protocolmapping>       <add binding="basichttpsbinding" scheme="https" />     </protocolmapping>     <servicehostingenvironment aspnetcompatibilityenabled="true" multiplesitebindingsenabled="true" />   </system.servicemodel>   <system.webserver>     <modules runallmanagedmodulesforallrequests="true"/>     <directorybrowse enabled="true"/>   </system.webserver> </configuration> 

error 1 'wcfservice2.service1' not implement interface member 'wcfservice2.iservice1.sendmessage(wcfservice2.sendmessagerequest)'. 'wcfservice2.service1.sendmessage(wcfservice2.sendmessagerequest)' cannot implement interface member because not public. c:\users\phanikic\documents\visual studio 2013\projects\wcfservice2\wcfservice2\service1.svc.cs 12 18

as per knowledge these errors because of configurations , , body changes, make service run? in advance.