PHP SOAP:对象引用未设置为对象的实例

我需要你的帮助

我必须使用web服务SOAP中的PHP函数 请求XML如下所示

<OTA_HotelDescriptiveInfoRQ xmlns="http://www.opentravel.org/OTA/2003/05" Version="1">
   <POS>
      <Source AgentSine="user" AgentDutyCode="pass" />
   </POS>
   <HotelDescriptiveInfos>
      <HotelDescriptiveInfo ChainCode="H4U" HotelCode="696"/>
   </HotelDescriptiveInfos>
</OTA_HotelDescriptiveInfoRQ>

这是我尝试了几天的错误，但我无法解决它

Fatal error: Uncaught SoapFault exception: [soap:Server] System.Web.Services.Protocols.SoapException: Server was unable to process request. ---> System.NullReferenceException: Object reference not set to an instance of an object. at H4U.Webservices.OTA.SoapDispatcher.sendOTAHotelDescriptiveInfo(OTA_HotelDescriptiveInfoRQ OTA_HotelDescriptiveInfoRQ) --- End of inner exception stack trace --- in /home/dimavoya/public_html/soap/soap.php:43 Stack trace: #0 /home/dimavoya/public_html/soap/soap.php(43): SoapClient->__call('sendOTAHotelDes...', Array) #1 /home/dimavoya/public_html/soap/soap.php(43): SoapClient->sendOTAHotelDescriptiveInfo(Object(SoapVar)) #2 {main} thrown in 致命错误：未捕获SoapFault异常：[soap:Server]System.Web.Services.Protocols.SoapException:服务器无法处理请求。 --->System.NullReferenceException:对象引用未设置为对象的实例。在H4U.Webservices.OTA.SoapDispatcher.sendOTAHotelDescriptiveInfo（OTA_HotelDescriptiveInfoRQ OTA_HotelDescriptiveInfoRQ） ---内部异常堆栈跟踪结束-- 在/home/dimavoya/public_html/soap/soap.php中：43 堆栈跟踪： #0/home/dimavoya/public_html/soap/soap.php（43）：SoapClient->_调用（'sendOTAHotelDes…'，数组） #1/home/dimavoya/public_html/soap/soap.php（43）：SoapClient->sendOTAHotelDescriptiveInfo（对象（SoapVar）） #2{main}被抛出 我随时听候您的安排，以获取更多信息

提前感谢

可能的副本 Fatal error: Uncaught SoapFault exception: [soap:Server] System.Web.Services.Protocols.SoapException: Server was unable to process request. ---> System.NullReferenceException: Object reference not set to an instance of an object. at H4U.Webservices.OTA.SoapDispatcher.sendOTAHotelDescriptiveInfo(OTA_HotelDescriptiveInfoRQ OTA_HotelDescriptiveInfoRQ) --- End of inner exception stack trace --- in /home/dimavoya/public_html/soap/soap.php:43 Stack trace: #0 /home/dimavoya/public_html/soap/soap.php(43): SoapClient->__call('sendOTAHotelDes...', Array) #1 /home/dimavoya/public_html/soap/soap.php(43): SoapClient->sendOTAHotelDescriptiveInfo(Object(SoapVar)) #2 {main} thrown in