System.NullReferenceException wurde nicht behandelt.
  Message="Object reference not set to an instance of an object."
  Source="Windpark Kalkulation"
  StackTrace:
       at Windpark_Kalkulation.c_xml.getSingle(String name) in _
         C:\Users\bend0rrr\Documents\Visual Studio 2008\Projects\Windpark _
         Kalkulation\Windpark Kalkulation\c_xml.vb:line 43
       at Windpark_Kalkulation.ProjektNeu.checkStandard() in _
       C:\Users\bend0rrr\Documents\Visual Studio 2008\Projects\Windpark _
       Kalkulation\Windpark Kalkulation\ProjektNeu.vb:line 6
       at Windpark_Kalkulation.ProjektNeu.rb_Standard_CheckedChanged(Object _
       sender, EventArgs e) in C:\Users\bend0rrr\Documents\Visual Studio _
       2008\Projects\Windpark Kalkulation\Windpark _
       Kalkulation\ProjektNeu.vb:line 19
       at System.Windows.Forms.RadioButton.OnCheckedChanged(EventArgs e)
       at System.Windows.Forms.RadioButton.set_Checked(Boolean value)
       at Windpark_Kalkulation.ProjektNeu.InitializeComponent() in _
         C:\Users\bend0rrr\Documents\Visual Studio 2008\Projects\Windpark _
         Kalkulation\Windpark Kalkulation\ProjektNeu.Designer.vb:line 41
       at Windpark_Kalkulation.ProjektNeu..ctor() in _
       C:\Users\bend0rrr\Documents\Visual Studio 2008\Projects\Windpark _
       Kalkulation\Windpark Kalkulation\ProjektNeu.vb:line 3
       at Windpark_Kalkulation.Windparkmanager.bt_New_Click(Object sender, _
       EventArgs e) in C:\Users\bend0rrr\Documents\Visual Studio _
       2008\Projects\Windpark Kalkulation\Windpark _
       Kalkulation\Windparkmanager.vb:line 47
       at System.Windows.Forms.Control.OnClick(EventArgs e)
       at System.Windows.Forms.Button.OnClick(EventArgs e)
       at System.Windows.Forms.Button.OnMouseUp(MouseEventArgs mevent)
       at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons _
         button, Int32 clicks)
       at System.Windows.Forms.Control.WndProc(Message& m)
       at System.Windows.Forms.ButtonBase.WndProc(Message& m)
       at System.Windows.Forms.Button.WndProc(Message& m)
       at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
       at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
       at System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr hWnd, _
         Int32 msg, IntPtr wparam, IntPtr lparam)
       at System.Windows.Forms.UnsafeNativeMethods.DispatchMessageW(MSG& msg)
       at _
         System.Windows.Forms.Application.ComponentManager.System.Windows.Forms_
         .UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop(Int32 _
         dwComponentID, Int32 reason, Int32 pvLoopData)
       at System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner( _
       Int32 reason, ApplicationContext context)
       at System.Windows.Forms.Application.ThreadContext.RunMessageLoop(Int32 _
       reason, ApplicationContext context)
       at System.Windows.Forms.Application.Run(ApplicationContext context)
       at _
         Microsoft.VisualBasic.ApplicationServices.WindowsFormsApplicationBase._
         OnRun()
       at _
       Microsoft.VisualBasic.ApplicationServices.WindowsFormsApplicationBase.Do_
       ApplicationModel()
       at _
       Microsoft.VisualBasic.ApplicationServices.WindowsFormsApplicationBase.Ru_
       n(String[] commandLine)
       at Windpark_Kalkulation.My.MyApplication.Main(String[] Args) in _
       17d14f5c-a337-4978-8281-53493378c1071.vb:line 81
       at System.AppDomain._nExecuteAssembly(Assembly assembly, String[] args)
       at System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence _
         assemblySecurity, String[] args)
       at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()
       at System.Threading.ThreadHelper.ThreadStart_Context(Object state)
       at System.Threading.ExecutionContext.Run(ExecutionContext _
         executionContext, ContextCallback callback, Object state)
       at System.Threading.ThreadHelper.ThreadStart()
  InnerException: