System::Windows::Forms::Application::ThreadException event occured

SENDER: System.Threading.Thread

EXCEPTION: System.MissingFieldException
MESSAGE: Field not found: 'HelixToolkit.Wpf.Materials.Yellow'.
SOURCE: Octopus
CALL STACK
   at GH_GA.MainViewModel.UpdateSolutionGraphics(Int32 setVisibleIndividualsSolutionMeshVisibilityTo)
   at GH_GA.GA.RedrawSolutions(Int32 generation)
   at GH_GA.MainInteractionForm.Form1_Load(Object sender, EventArgs e)
   at System.Windows.Forms.Form.OnLoad(EventArgs e)
   at System.Windows.Forms.Form.OnCreateControl()
   at System.Windows.Forms.Control.CreateControl(Boolean fIgnoreVisible)
   at System.Windows.Forms.Control.CreateControl()
   at System.Windows.Forms.Control.WmShowWindow(Message& m)
   at System.Windows.Forms.Control.WndProc(Message& m)
   at System.Windows.Forms.Form.WmShowWindow(Message& m)
   at GH_GA.MainInteractionForm.WndProc(Message& m)
   at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)