Since we have upgraded to dnn 5.0 we keep getting the following error very regularly in our event log - atleast 30 times a day. And when this happens the page is not rendered. Can someone please guide what could be the issue and where to look for? Your help is sincerely appreciated, I am totally blank on this one - get understand what this greek and latin is:-

AssemblyVersion: 05.00.00
PortalID: 0
PortalName: Umaisa LLC
UserID: -1
UserName: 
ActiveTabID: 81
ActiveTabName: UStore
RawURL: /Default.aspx?tabid=81&List=0
AbsoluteURL: /Default.aspx
AbsoluteURLReferrer: http://www.umaisa.in/Default.aspx?tabid=81&List=0
UserAgent: Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US) AppleWebKit/525.19 (KHTML, like Gecko) Chrome/1.0.154.48 Safari/525.19
DefaultDataProvider: DotNetNuke.Data.SqlDataProvider, DotNetNuke.SqlDataProvider
ExceptionGUID: 5d153adb-e0e3-494e-8d7e-957ec19aa90a
InnerException: Exception has been thrown by the target of an invocation.
FileName: 
FileLineNumber: 0
FileColumnNumber: 0
Method: System.Web.Script.Serialization.JavaScriptObjectDeserializer.DeserializePrimitiveObject
StackTrace: 
Message: DotNetNuke.Services.Exceptions.PageLoadException: Exception has been thrown by the target of an invocation. ---> System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.ArgumentException: Invalid JSON primitive: .at System.Web.Script.Serialization.JavaScriptObjectDeserializer.DeserializePrimitiveObject()at System.Web.Script.Serialization.JavaScriptObjectDeserializer.DeserializeInternal(Int32 depth)at System.Web.Script.Serialization.JavaScriptObjectDeserializer.BasicDeserialize(String input, Int32 depthLimit, JavaScriptSerializer serializer)at System.Web.Script.Serialization.JavaScriptSerializer.Deserialize(JavaScriptSerializer serializer, String input, Type type, Int32 depthLimit)at System.Web.Script.Serialization.JavaScriptSerializer.Deserialize[T](String input)--- End of inner exception stack trace ---at System.RuntimeMethodHandle._InvokeMethodFast(Object target, Object[] arguments, SignatureStruct& sig, MethodAttributes methodAttributes, RuntimeTypeHandle typeOwner)at System.RuntimeMethodHandle.InvokeMethodFast(Object target, Object[] arguments, Signature sig, MethodAttributes methodAttributes, RuntimeTypeHandle typeOwner)at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture, Boolean skipVisibilityChecks)at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)at DotNetNuke.UI.Utilities.Reflection.InvokeGenericMethod[T](Type Type, String MethodName, Object Target, Object[] Args)at DotNetNuke.UI.Utilities.MSAJAX.Deserialize[T](String Data)at DotNetNuke.UI.Utilities.ClientAPI.GetClientVariableList(Page objPage)at DotNetNuke.UI.Utilities.ClientAPI.RegisterClientVariable(Page objPage, String strVar, String strValue, Boolean blnOverwrite)at DotNetNuke.UI.Utilities.ClientAPI.RegisterClientReference(Page objPage, ClientNamespaceReferences eRef)at DotNetNuke.UI.Utilities.ClientAPI.RegisterClientReference(Page objPage, ClientNamespaceReferences eRef)at DotNetNuke.UI.WebControls.DnnTree.RegisterClientScript()at DotNetNuke.UI.WebControls.DnnTree.DnnTree_PreRender(Object sender, EventArgs e)at System.Web.UI.Control.OnPreRender(EventArgs e)at System.Web.UI.Control.PreRenderRecursiveInternal()at System.Web.UI.Control.PreRenderRecursiveInternal()at System.Web.UI.Control.PreRenderRecursiveInternal()at System.Web.UI.Control.PreRenderRecursiveInternal()at System.Web.UI.Control.PreRenderRecursiveInternal()at System.Web.UI.Control.PreRenderRecursiveInternal()at System.Web.UI.Control.PreRenderRecursiveInternal()at System.Web.UI.Control.PreRenderRecursiveInternal()at System.Web.UI.Control.PreRenderRecursiveInternal()at System.Web.UI.Control.PreRenderRecursiveInternal()at System.Web.UI.Control.PreRenderRecursiveInternal()at System.Web.UI.Control.PreRenderRecursiveInternal()at System.Web.UI.Control.PreRenderRecursiveInternal()at System.Web.UI.Control.PreRenderRecursiveInternal()at System.Web.UI.Control.PreRenderRecursiveInternal()at System.Web.UI.Control.PreRenderRecursiveInternal()at System.Web.UI.Control.PreRenderRecursiveInternal()at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)--- End of inner exception stack trace ---
Source: 
Server Name: IIS324

I am getting this error in my event log as well.  For me it logs two errors when the AJAX Toolkit rating control is selected.  It logs two errors everytime.

DNN 5.0.1 Portal

First error is this one: System.Web.Script.Serialization.JavaScriptObjectDeserializer.DeserializePrimitiveObject

Second one is:

Method: System.Web.HttpResponse.Redirect
StackTrace:
Message: System.Exception: Unhandled Error: ---> System.ApplicationException: Response.Redirect cannot be called in a Page callback. at System.Web.HttpResponse.Redirect(String url, Boolean endResponse) at DotNetNuke.Services.Exceptions.Exceptions.ProcessPageLoadException(Exception exc, String URL) at DotNetNuke.Framework.PageBase.OnError(EventArgs e) at System.Web.UI.Page.HandleError(Exception e) at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) at System.Web.UI.Page.ProcessRequest(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) at System.Web.UI.Page.ProcessRequest() at System.Web.UI.Page.ProcessRequestWithNoAssert(HttpContext context) at System.Web.UI.Page.ProcessRequest(HttpContext context) at ASP.default_aspx.ProcessRequest(HttpContext context) at System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) --- End of inner exception stack trace ---

Strange thing is that the module still functions correctly.  It is just annoying to see all these errors in the event log.

Hi

I was talking about Microsoft ASP.NET AJAX Extensions.

The AJAX toolkit is well known for conflicts. For instance if you have two third party modules that require AJAX toolkit they might need different versions of it. Also modules are fussy on which particular version of AJAX toolkit it requires. AJAX toolkit is not particularly backwards or forwards compatible.

Currently DNN is not bundled with AJAX toolkit... Contact the people who are supplying your module for answers.