inernal error server 500 in ajax call ?

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ASP.NET

Javascript

IIS

, +

i called my action .asmx by method

ajaxCall: function (serverMethod, params, successHandler) {
       var csrfToken = $("input[name='__RequestVerificationToken']").val();
       //alert('csrfToken= ' + csrfToken);

       $.ajax({
           headers: { __RequestVerificationToken: csrfToken },
           cache: false,
           async: false,
           type: "POST",
           url: "Server/services/Actions.asmx/" + serverMethod + "?sid=" + app.sessionId,
           data: params,
           contentType: "application/json; charset=utf-8",
           dataType: "json",
           dataFilter: function (data) {
               var msg;

               if (typeof (JSON) !== 'undefined' && typeof (JSON.parse) === 'function')
                   msg = JSON.parse(data);
               else
                   msg = eval('(' + data + ')');

               if (msg.hasOwnProperty('d'))
                   return msg.d;
               else
                   return msg;
           },
           success: function (response) {

               if (!response) {
                   datacontext.log(response.statusText, response, this, 'error1');
               }

               successHandler(response);
               var j = response;
               //for (var i = 0; i < j.length; i++) {
               //    successHandler(j[i]);
               //}
           },
           error: function (xhr) {
               datacontext.log(xhr.statusText, xhr, this, 'error');
           }
       });
   },

it works well when i debug my project (Single Page Application) in vs2012
,even when i puplish my site on local iis in my pc
but when i puplish my website on iis on aremote server i got internal server error 500 when call ajaxcall method
and when i typed url of asmx (www.mysite.com/Server/services/Actions.asmx/GetNewsCount?sid=1)

i got this response on the browser

System.NotSupportedException: The type System.Collections.Generic.Dictionary`2[[System.String, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089],[System.String, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089]] is not supported because it implements IDictionary.
   at System.Xml.Serialization.TypeScope.GetDefaultIndexer(Type type, String memberInfo)
   at System.Xml.Serialization.TypeScope.ImportTypeDesc(Type type, MemberInfo memberInfo, Boolean directReference)
   at System.Xml.Serialization.TypeScope.GetTypeDesc(Type type, MemberInfo source, Boolean directReference, Boolean throwOnError)
   at System.Xml.Serialization.ModelScope.GetTypeModel(Type type, Boolean directReference)
   at System.Xml.Serialization.XmlReflectionImporter.ImportTypeMapping(Type type, XmlRootAttribute root, String defaultNamespace)
   at System.Web.Services.Protocols.XmlReturn.GetInitializers(LogicalMethodInfo[] methodInfos)
   at System.Web.Services.Protocols.XmlReturnWriter.GetInitializers(LogicalMethodInfo[] methodInfos)
   at System.Web.Services.Protocols.MimeFormatter.GetInitializers(Type type, LogicalMethodInfo[] methodInfos)
   at System.Web.Services.Protocols.HttpServerType..ctor(Type type)
   at System.Web.Services.Protocols.HttpServerProtocol.Initialize()
   at System.Web.Services.Protocols.ServerProtocolFactory.Create(Type type, HttpContext context, HttpRequest request, HttpResponse response, Boolean& abortProcessing)

please any one know how to solve this ?