Could not establish trust relationship for the SSL/TLS secure channel with authority


i got a Console application and added a service reference for 1 HTTPS web service. below is my code to call the web service method:

using (clsSoapPortClient client = new clsSoapPortClient())

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when the code reach the client.charge(); method i hit the error "Could not establish trust relationship for the SSL/TLS secure channel with authority".

below is my app.config setting:

        <binding name="clsE1EWIG2SoapBinding" closeTimeout="00:01:00"
          openTimeout="00:01:00" receiveTimeout="00:10:00" sendTimeout="00:01:00"
          allowCookies="false" bypassProxyOnLocal="false" hostNameComparisonMode="StrongWildcard"
          maxBufferSize="65536" maxBufferPoolSize="524288" maxReceivedMessageSize="65536"
          messageEncoding="Text" textEncoding="utf-8" transferMode="Buffered"
          <readerQuotas maxDepth="32" maxStringContentLength="8192" maxArrayLength="16384"
            maxBytesPerRead="4096" maxNameTableCharCount="16384" />
          <security mode="Transport">
            <transport clientCredentialType="None" proxyCredentialType="None"
              <extendedProtectionPolicy policyEnforcement="Never" />
            <message clientCredentialType="UserName" algorithmSuite="Default" />

      <endpoint address="" binding="basicHttpBinding"
        bindingConfiguration="clsSoapBinding" contract="ServiceReference1.clsSoapPort"
        name="clsSoapPort" />

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please help..
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