Page Method question

Dear experts,

I have a javascript function that is called on tab change of a tab container. From that javascript function, I call a simple page method. But though the page method does everything correctly, a failure is reported.
Here is my code:
function JSSetMarketingActiveTabIndexSession(sender, args) {
if (sender != null) {
PageMethods.SetSessionVariable("MarketingActiveTabIndex", sender.get_activeTabIndex(), OnSucceeded, OnFailed);
}
}

[System.Web.Services.WebMethod]
public static void SetSessionVariable(string sessionVariableName, object value)
{
HttpContext.Current.Session[sessionVariableName] = value;
}

When I place breakpoints in the page method and in the OnFailed function, the execution stops in both of them almost at the same time, so an exception is caught even before the page method has done anything.
Could you please help me on this?
Thanks.

Quote:

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When I place breakpoints in the page method and in the OnFailed function

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Well i dont see either of these two posted in your short code snip ...

BTW.. Please use code tags .. [code] your code here [/code]

Quote:

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Originally Posted by GremlinSA

Well i dont see either of these two posted in your short code snip

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My page method is this:

Code:

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[System.Web.Services.WebMethod]
public static void SetSessionVariable(string sessionVariableName, object value)
{
HttpContext.Current.Session[sessionVariableName] = value;
}

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On Failed():

Code:

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        function OnFailed(exception) {
            if (exception != null) {
                var tabInformation = $get('<%# Page.Form.FindControl("tcInformation").ClientID %>').control;
                tabInformation.set_activeTabIndex(2);     
                   
                lblExceptionDetails = document.getElementById('<%# lblExceptionDetails.ClientID %>');
                if (lblExceptionDetails != null) {
                    lblExceptionDetails.innerHTML = exception._message;
                    return false;
                }
            }
        }

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I've looked over the code and done a few test's and cant find anything wrong.. I'm guessing that you have other code that is run either at 'pageload' or a controls 'onload' event that is failing...

check all the controls if they have an onload event and what code is running there...

Thank you anyway.