mayavi
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raitError: The '_vtk_obj' trait of an ExtractVOI instance must be a vtkObjectBase or None
when i want to from mayavi import mlab,it said TraitError: The '_vtk_obj' trait of an ExtractVOI instance must be a vtkObjectBase or None, but a value of (vtkmodules.vtkImagingCore.vtkExtractVOI)0x7f6841e31160 <class 'vtkmodules.vtkImagingCore.vtkExtractVOI'> was specified.