How to remove this jscript error message related to collapsible panel when click on linkbutton?

Hi all,

Hope doing well,

sir i am using one collapsible panel the code is like this:

 <asp:Panel ID="showhidefilter1" runat="server" style="cursor:pointer">
                                    <img src="../images/ico-filter.gif" />
                                    <asp:Label ID="Label3" runat="server" Text="Show Filter" CssClass="urllink"></asp:Label></asp:Panel>

<ajt:CollapsiblePanelExtender ID="CollapsiblePanelExtender2" CollapseControlID="showhidefilter1" ExpandControlID="showhidefilter1" Collapsed="true" ExpandDirection="Vertical" CollapsedText="Show Filter" ExpandedText="Hide Filter"  TargetControlID="Panel3" runat="server" TextLabelID="Label3">
            </ajt:CollapsiblePanelExtender>

so this panel name i am using as target control id.

now in linkbutton click event i called this panel id

some visible = false;

when i click on this link button getting this error message:

Microsoft JScript runtime error: Sys.ArgumentException: Failed to find element "ctl00_cphMain_showhidefilter1"
Parameter name: CollapseControlID

thanks