Ravi, if you are using the cvs version of VTK, vtkImagePlaneWidgets, and all the other widgets, have been moved from /VTK/Hybrid to /VTK/Widgets . Dean hi VTKUsers, I am back with a similar problem. When I initialize an object for the class vtkImagePlaneWidget class vtkImagePlaneWidget* planeWidgetZ = vtkImagePlaneWidget::New(); I get the following error: