C# error wcf services

Question

I am trying to deploy an WCF, using Internet Information Service. I worked with visual studio 2015. But i got this error:

Configuration binding extension 'system.serviceModel/bindings/true' could not be found. Verify that this binding extension is properly registered in system.serviceModel/extensions/bindingExtensions and that it is spelled correctly.

My Web.config is the following:

<?xml version="1.0"?>
<configuration>

  <appSettings>
    <add key="aspnet:UseTaskFriendlySynchronizationContext" value="true" />
  </appSettings>


  <system.web>
    <compilation debug="false" targetFramework="4.5.2" />
    <httpRuntime targetFramework="4.5.2"/>
  </system.web>
  <system.serviceModel>
    <services>
      <service name="ClientWebS.UserService"
               behaviorConfiguration="mex">
        <endpoint address="UserService" binding="wsHttpBinding"
           contract="ClientWebS.IUserService"></endpoint>
        <host>
          <baseAddresses>
            <add baseAddress="http://localhost:8080/"/>
          </baseAddresses>
        </host>
      </service>
    </services>
    <behaviors>
      <serviceBehaviors>
        <behavior name="mex">
          <serviceMetadata httpGetBinding="true"/>
        </behavior>
      </serviceBehaviors>
    </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>

Thanks for help!!