getting this error in webservices in local host

<configuration>

  <appsettings>
    <add key="aspnet:UseTaskFriendlySynchronizationContext" value="true" />
  </appsettings>
  <system.web>
    <compilation debug="true" targetframework="4.0" />
    <httpruntime />
  </system.web>
  <system.servicemodel>
    <services>
      <service name="MyRESTService.ProductRESTService" behaviorconfiguration="serviceBehavior">
        <endpoint address="">
 binding="webHttpBinding"
                               contract="MyRESTService.IProductRESTService"
                              behaviorConfiguration="web"></endpoint>

        <host>
          <baseAddresses>
            <add baseaddress="http://localhost:50743/MyRESTService/" />
          </baseAddresses>
        </host>
      </service>
    </services>
    <behaviors>
      <servicebehaviors>
        <behavior name="serviceBehavior">
          <servicemetadata httpgetenabled="true" />
          <servicedebug includeexceptiondetailinfaults="false" />
        </behavior>
      </servicebehaviors>
      <endpointbehaviors>
        <behavior name="web">
          <webhttp />
        </behavior>
      </endpointbehaviors>

    </behaviors>

  </system.servicemodel>
  <system.webserver>
    <modules runallmanagedmodulesforallrequests="true" />
    <!--
        To browse web app root directory during debugging, set the value below to true.
        Set to false before deployment to avoid disclosing web app folder information.
      -->
    <directorybrowse enabled="true" />
  </system.webserver>

</configuration>

<%@ ServiceHost Language="C#" Debug="true" Service="MyRESTService.ProductRESTService" CodeBehind="ProductRESTService.svc.cs" %>

The type 'MyRESTService.ProductRESTService', provided as the Service attribute value in the ServiceHost directive, or provided in the configuration element system.serviceModel/serviceHostingEnvironment/serviceActivations could not be found.