Could not send Message error in soap ui

Hi every one i am hitting a request but couldn't get a proper response it is giving the error message Could not send Message:

request:

<soapenv:Envelope xmlns:ser="http://ift.tt/2jgmf59" xmlns:soapenv="http://ift.tt/sVJIaE">
   <soapenv:Header>
      <wsse:Security soapenv:mustUnderstand="1" xmlns:wsse="http://ift.tt/LRW8Ij" xmlns:wsu="http://ift.tt/Hm2joJ">
         <wsu:Timestamp wsu:Id="TS-310D99CAA1352C2D72151247070439254">
            <wsu:Created>2017-12-05T10:45:04.392Z</wsu:Created>
            <wsu:Expires>2017-12-05T10:46:04.392Z</wsu:Expires>
         </wsu:Timestamp>
         <wsse:UsernameToken wsu:Id="UsernameToken-310D99CAA1352C2D72151247070213053">
            <wsse:Username>gateway</wsse:Username>
            <wsse:Password Type="http://ift.tt/1aTA7XU">gatewaypassword</wsse:Password>
            <wsse:Nonce EncodingType="http://ift.tt/14yUvuM">aF3kelw3IMek1LBLuVjJMg==</wsse:Nonce>
            <wsu:Created>2017-12-05T10:45:02.130Z</wsu:Created>
         </wsse:UsernameToken>
      </wsse:Security>
      <ser:charterHeaderInputInfo>
         <clientIp>?</clientIp>
         <clientHostName>?</clientHostName>
         <clientCallingService>?</clientCallingService>
         <auditUser>?</auditUser>
         <transactionId>?</transactionId>
         <!--Optional:-->
         <overrideCache>?</overrideCache>
      </ser:charterHeaderInputInfo>
   </soapenv:Header>
   <soapenv:Body>
      <ser:getServiceabilityRequest>
         <addressType>residential</addressType>
         <!--Optional:-->
         <addressLine1>1573W N TROSPER BLVD</addressLine1>
         <!--Optional:-->
         <city>PALMHURST</city>
         <!--Optional:-->
         <territoryCode>TX</territoryCode>
         <!--Optional:-->
         <postalCode>78573</postalCode>
         <limit>10</limit>
         <offset>0</offset>
      </ser:getServiceabilityRequest>
   </soapenv:Body>
</soapenv:Envelope>

response:

<soap:Envelope xmlns:soap="http://ift.tt/sVJIaE">
   <soap:Body>
      <soap:Fault>
         <faultcode>soap:Server</faultcode>
         <faultstring>Could not send Message.</faultstring>
         <detail>
            <ns1:EnterpriseServiceabilityServiceException xmlns:ns1="http://ift.tt/2jgmf59"/>
         </detail>
      </soap:Fault>
   </soap:Body>
</soap:Envelope>

Can anyone tell me what could be the cause of this error. Is it my code problem or my request problem ?