System.NullReferenceException: Object reference not set to an instance of an object. at HSEWeb.Waste.Waste.divWorkflow(String docNumber) in D:\Dev Projects\HSE\HSEWeb\Waste\Waste.aspx.cs:line 2550 at HSEWeb.Waste.Waste.Page_Load(Object sender, EventArgs e) in D:\Dev Projects\HSE\HSEWeb\Waste\Waste.aspx.cs:line 295