JavaScript runtime error: Sys.ArgumentNullException: Value cannot be null.

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I am getting the following error:
JavaScript runtime error: Sys.ArgumentNullException: Value cannot be null.
Parameter name: panelsCreated[9]
while pointing to the following code in file(ScriptResource.axd...[dynamic]):

$type.registerClass('Sys.WebForms.InitializeRequestEventArgs', Sys.CancelEventArgs);
$type = Sys.WebForms.PageLoadedEventArgs = function PageLoadedEventArgs(panelsUpdated, panelsCreated, dataItems) {
    /// <summary locid="M:J#Sys.WebForms.PageLoadedEventArgs.#ctor">The arguments for the PageRequestManager's pageLoaded event. The pageLoaded event is raised after the DOM has been updated.</summary>
    /// <param name="panelsUpdated" type="Array">An array of UpdatePanels that were updated.</param>
    /// <param name="panelsCreated" type="Array">An array of UpdatePanels that were created.</param>
    /// <param name="dataItems" type="Object" mayBeNull="true"></param>
    var e = Function._validateParams(arguments, [
        {name: "panelsUpdated", type: Array},
        {name: "panelsCreated", type: Array},
        {name: "dataItems", type: Object, mayBeNull: true}
    ]);
    if (e) throw e;
    Sys.WebForms.PageLoadedEventArgs.initializeBase(this);

    this._panelsUpdated = panelsUpdated;
    this._panelsCreated = panelsCreated;
    this._dataItems = dataItems || new Object();
}

with line : " if (e) throw e" highlighted.

This is happening when I click for Detail some item from a table that shows the results of a search.
The button successfully calls/executes a method, and then produces the error.

The code is below:

<HeaderTemplate>
                Detalhar
            </HeaderTemplate>
            <ContentTemplate>
                <div class="botoescima">
                    <table id="botoesNavegacao" style="background-image: removed('../../App_Themes/Default/Imagens/ie/active_middle.jpg');"
                        border="0" cellpadding="0" cellspacing="0">
                        <tr>
                            <td id="tdItens"  runat="server">
                                <img alt="" src="../../App_Themes/Default/Imagens/ie/active_left.jpg" />
                            </td>
                            <td id="tdItens1" width="70px" align="center"  runat="server">
                                <asp:LinkButton BackColor="Transparent" ID="BotaoIncluirItem" runat="server" AccessKey="S"
                                    ValidationGroup="Detalhar" Visible="false">
                                    <span class="textoAbaInterna">Itens</span>
                                </asp:LinkButton>
                            </td>
                            <td id="tdItens2"  runat="server">
                                <img alt="" src="../../App_Themes/Default/Imagens/ie/active_right.jpg" />
                            </td>
                            <td id="tdParcelas"  runat="server">
                                <img alt="" src="../../App_Themes/Default/Imagens/ie/active_left.jpg" />
                            </td>
                            <td id="tdParcelas1" width="70px" align="center"  runat="server">
                                <asp:LinkButton BackColor="Transparent" ID="BotaoIncluirParcelas" runat="server"
                                    AccessKey="S" ValidationGroup="Detalhar" Visible="false">
                                    <span class="textoAbaInterna">Parcelas</span>
                                </asp:LinkButton>
                            </td>
                            <td id="tdParcelas2"  runat="server">
                                <img alt="" src="../../App_Themes/Default/Imagens/ie/active_right.jpg" />
                            </td>
                        </tr>
                    </table>
                    <div id="divAbasInternas"  runat="server" class="divFormularioAba">
                    </div>
                </div>
                <uc2:PickerCliente ID="PickerClienteDetalhe"  runat="server" />
                <uc5:PickerRepresentante ID="PickerRepresentanteDetalhe"  runat="server" />
                <uc3:PickerCondicaoParcelamento ID="PickerCondicaoParcelamento"  runat="server" />
                <uc4:PickerTransportador ID="PickerTransportador"  runat="server" />
                <table>
                    <tr>
                        <td>
                            <gama:ValidationSummaryGama ID="ValidationSummary2"  runat="server" ValidationGroup="Detalhar" />
                        </td>
                    </tr>
                </table>
                <asp:Panel ID="panelConteudoImpressao" runat="server">
                    <asp:FormView ID="FormView" runat="server" DataSourceID="ObjectContainerDataSourceDetalhar"
                        DataKeyNames="IDOrcamentoVenda" OnDataBound="FormView_DataBound">
                        <EditItemTemplate>
                            <table id="tabelaNovoCliente" class="TabelaFormView">
                                <tr>

ANY IDEAS what the problem is? or how can find it???