从jQuery调用ASP.NET ASMX Web服务

我究竟做错了什么？！

这是我的jQuery调用：

$.ajax({
            type: "POST",url: '/Services/TeamPerson.asmx',contentType: "application/json; charset=utf-8",data: {'active':false,'team_id':team_id,'player_id':player_id},dataType: "json",success: function(msg) {
              alert(msg);
            },error: function(xhr,msg) { alert(msg + '\n' + xhr.responseText); }
          });

这是我的网络服务：

[WebService(Namespace = "http://tempuri.org/")]
  [WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
  [ToolBoxItem(false)]
  [ScriptService]
  public class TeamPerson : WebService
  {
    [WebMethod]
    [ScriptMethod(ResponseFormat = ResponseFormat.Json)]
    public void SetPlayerStatus(bool active,ulong team_id,ulong player_id)
    {
      // blah blah
    }
  }

我收到一个令人讨厌的SOAP错误：

<?xml version="1.0" encoding="utf-8"?><soap:Envelope xmlns:soap="http://www.w3.org/2003/05/soap-envelope" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
<soap:Body><soap:Fault><soap:Code>
    <soap:Value>soap:Receiver</soap:Value></soap:Code>
    <soap:Reason><soap:Text xml:lang="en">
     System.Web.Services.Protocols.soapException: Server was unable to process request. ---&gt; 
     System.Xml.XmlException: Data at the root level is invalid. Line 1,position 1.   
   at System.Xml.XmlTextReaderImpl.Throw(Exception e)    
   at System.Xml.XmlTextReaderImpl.Throw(String res,String arg)    
   at System.Xml.XmlTextReaderImpl.ParseRootLevelWhitespace()    
   at System.Xml.XmlTextReaderImpl.ParseDocumentContent()    
   at System.Xml.XmlTextReaderImpl.Read()    
   at System.Xml.XmlTextReader.Read()   
   at System.Web.Services.Protocols.soapServerProtocol.soapEnvelopeReader.Read()    
   at System.Xml.XmlReader.MovetoContent()    
   at System.Web.Services.Protocols.soapServerProtocol.soapEnvelopeReader.MovetoContent()    
   at System.Web.Services.Protocols.soapServerProtocolHelper.GetRequestElement()    
   at System.Web.Services.Protocols.soap12ServerProtocolHelper.RouteRequest()    
   at System.Web.Services.Protocols.soapServerProtocol.RouteRequest(SoapServerMessage message)    
   at System.Web.Services.Protocols.soapServerProtocol.Initialize()
       at System.Web.Services.Protocols.ServerProtocol.SetContext(Type type,HttpContext context,HttpRequest request,HttpResponse response)

   at System.Web.Services.Protocols.ServerProtocolFactory.Create(Type type,HttpResponse response,Boolean&amp; abortProcessing)

   --- End of inner exception stack trace ---</soap:Text></soap:Reason><soap:Detail /></soap:Fault></soap:Body></soap:Envelope>

我可以通过我的浏览器点击/Services/TeamPerson.asmx并且web方法正常.我还在web.config中定义了以下内容：

<httpHandlers>
   <remove verb="*" path="*.asmx"/>
   <add verb="*" path="*.asmx" validate="false" type="System.Web.Script.Services.ScriptHandlerFactory,System.Web.Extensions,Version=3.5.0.0,Culture=neutral,PublicKeyToken=31BF3856AD364E35"/>
   <add verb="*" path="*_AppService.axd" validate="false" type="System.Web.Script.Services.ScriptHandlerFactory,PublicKeyToken=31BF3856AD364E35"/>
   <add verb="GET,HEAD" path="ScriptResource.axd" type="System.Web.Handlers.ScriptResourceHandler,PublicKeyToken=31BF3856AD364E35" validate="false"/>
      <add verb="GET,HEAD,POST" path="TinyMCEHandler.aspx" type="Moxiecode.TinyMCE.Web.HttpHandler,Moxiecode.TinyMCE" />
  </httpHandlers>
  <httpModules>
   <add name="ScriptModule" type="System.Web.Handlers.ScriptModule,PublicKeyToken=31BF3856AD364E35"/>
  </httpModules>