Hosting a WCF service using net tcp binding. Error: Service metadata may not be accessible

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

  <system.web>
    <compilation debug="true" targetFramework="4.0" />
  </system.web>
  <system.serviceModel>
   
    <standardEndpoints>
      </standardEndpoints>
    <bindings>
     </bindings>
    <services>
      <service behaviorConfiguration="metadatabehaviour" name="WCF_Service.HistorianService">
        <endpoint address="" binding="basicHttpBinding" bindingConfiguration=""
          contract="WCF_Service.IHistorianCollectorService" />
        <endpoint address="net.tcp://localhost:8081/mex" binding="mexTcpBinding"
          contract="IMetadataExchange" />
        <endpoint address="net.tcp://localhost:8081" binding="netTcpBinding"
          contract="WCF_Service.IHistorianCollectorService" />
      </service>
    </services>
    <behaviors>
      <serviceBehaviors>
        <behavior name="metadatabehaviour">
          <serviceMetadata httpGetEnabled="false" />
          <serviceDebug includeExceptionDetailInFaults="false" />
        </behavior>
      </serviceBehaviors>
    </behaviors>
    
    <serviceHostingEnvironment multipleSiteBindingsEnabled="false" />
  </system.serviceModel>
 <system.webServer>
    <modules runAllManagedModulesForAllRequests="true"/>
  </system.webServer>
  
</configuration>

And I am getting the following error: Failed to add a service. Service metadata may not be accessible. Make sure your service is running and exposing metadata.I can successfully run the service if I am just implementing the "basicHttpBinding" but as soon as I introduce a "netTcp" binding, I start getting this error. I have changed the 'mex' binding to 'mexTcpBinding' but still the error persists. I have tried toggling the relevant properties. Any idea how I can correct this error?