Unable to consume wcf service from DLL running on HTTPS

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WCF

WebConfig

This is my code if ----------------

namespace PAS
{
    public class PASMail : IPASMail
    {
        public string DoWork(string masterstring)
        {
            SMS_Email email = new SMS_Email();
            return email.SendEml(masterstring);
        }
    }
}

Config File -----------------------------------

<services>
     <service name="PAS.PasEmailer.PASMail" behaviorConfiguration="mybehaviour">
        <endpoint address="" binding="basicHttpBinding" bindingConfiguration="BasicHttpBinding_IService1" contract="PasEmailer.IPASMail"        name="BasicHttpBinding_IPASMail" />
      </service>
</services>

<bindings>
    <basicHttpBinding>
        <binding name="BasicHttpBinding_IService1" closeTimeout="00:10:00" openTimeout="00:10:00" sendTimeout="00:20:00" maxReceivedMessageSize="56384" maxBufferSize="56384" messageEncoding="Mtom" textEncoding="utf-8" >
          <readerQuotas  maxDepth="32" maxStringContentLength="8192" maxArrayLength="16384" maxBytesPerRead="4096" maxNameTableCharCount="16384" />
          <security mode="None" >
            <transport clientCredentialType="None" proxyCredentialType="None" realm=""/>
            <message clientCredentialType="UserName" algorithmSuite="Default"/>
          </security>
        </binding>
    </basicHttpBinding>
</bindings>
<behaviors>
      <serviceBehaviors>
        <behavior name="mybehaviour">
          <serviceMetadata httpGetEnabled="true"  />
          <serviceDebug includeExceptionDetailInFaults="false" />
          <dataContractSerializer maxItemsInObjectGraph="2147483647"/>
        </behavior>
        <behavior name="">
          <serviceMetadata httpsGetEnabled="true"  />

          <serviceDebug includeExceptionDetailInFaults="false" />
          <dataContractSerializer maxItemsInObjectGraph="2147483647"/>
        </behavior>
      </serviceBehaviors>
    </behaviors>

-------------
And i am getting this error

The content type text/html; charset=UTF-8 of the response message does not match the content type of the binding (text/xml; charset=utf-8). If using a custom encoder, be sure that the IsContentTypeSupported method is implemented properly.