SOAP 1.1 Request Fatal Error Uncaught SoapFault exception: [

我的请求如下:

 $client = new SoapClient("http://xxx.de:8080xxxWebService?wsdl", array("trace" => 1, "soap_version" => SOAP_1_1));
$result = $client->__soapCall("calcMietpreis", array('calAbholdatum' => "2015-08-08 11:14:15", 'calRueckgabedatum' => "2015-08-09 11:14:15"));

，我得到以下错误信息:

Fatal error: Uncaught SoapFault exception: [soapenv:Server] Exception occurred while trying to invoke service method calcMietpreis in /srv/www/htd...

我不知道现在该怎么办…我几乎到处都找遍了。

我安装了php扩展SOAP和_getFunctions给我现有的函数。