Treeview is not expanding\collapsing

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ASP.NET

Javascript

Hi,

I have doubt regarding in Treeview control when i am trying to click on link present to see my child controls its showing some javascript error mssg javascript:Treeview_ToggleNode() some in my application nothing javascript has been there but it was showing this error when i am trying to click on parent node to see my child node nothing wrong there. what should i do want to see child node when parent click in my treeview.

<asp:TreeView ID="TreeView1" runat="server" >
    <Nodes>

            <asp:TreeNode Text="Hi" Value="Hi">
                <asp:TreeNode Text="Hello" Value="Hello">
                    <asp:TreeNode Text="H r u" Value="H r u">
                </asp:TreeNode>
            </asp:TreeNode>
        </asp:TreeNode>
    </Nodes>
</asp:TreeView>

I am using above simple code to display tree view.

When i mouse over of treeview it's showing javascript error(javascript:Treeview_ToggleNode()).

The same code it's working fine in another system.

Could any one help me on how to fix this issue.

Thanks
venkat.