Hello all,
Can you help me about ajax toolkit popup?
when I run program and click button for show Popup it always show messagebox as below.

Error.png


in this popup have one TreeView it get data from table that have 1000 record. if this popup not get data from database it can show smoothly.
and other way, when run it in Mozilla it can show smoothly too. I try to fix it but can not.
you can help me to solve it? or you can write code that good for it in get alot of data.

Please see some code below:
                        runat="server"
                        DynamicServicePath=""
                        Enabled="True"
                        TargetControlID="btnSearch"
                        BackgroundCssClass="modalBackground"
                        PopupControlID="PanelLocation"           
                        CancelControlID="btnCalcelLocation"
                        DropShadow="false">
                 
                   
              <%--  
--%>
                       



Thank Advance.