Server Error in '/' Application.

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protected void RadGrid1_ItemCommand(object sender, GridCommandEventArgs e)
{
    if (e.CommandName == RadGrid.ExportToExcelCommandName)
    {
        // Turn off the Filtering
        RadGrid1.AllowFilteringByColumn = false;
        // Apply the changes
        RadGrid1.Rebind();
        // Get the Export Output
        var GenXlsxOut = RadGrid1.MasterTableView.GenerateXlsxOutput();

        // Change the Output as needed and proceed with the Export
    }
}

protected void RadButton1_Click(object sender, EventArgs e)
{
    // Turn off the Filtering
    RadGrid1.AllowFilteringByColumn = false;
    // Apply the changes
    RadGrid1.Rebind();
    // Get the Export Output
    var GenXlsxOut = RadGrid1.MasterTableView.GenerateXlsxOutput();

    // Change the Output as needed and proceed with the Export

    /* 
        * NOTE: If the Output is only needed to be saved for future use and not exporting it at all
        * be sure to turn the filtering back on
    */

    //RadGrid1.AllowFilteringByColumn = true; // Turn Filtering back on
    //RadGrid1.Rebind(); // Apply changes
}