[vtkusers] vtkPolyData is required??

[董辉]

Hello  all,
   There is a Problem in  my  project  “ERROR: In ..\..\VTK 5.8.0\vtk-5.8.0\Filtering\vtkDemandDrivenPipeline.cxx, line 827
vtkStreamingDemandDrivenPipeline (0AA3DA80): Input for connection index 0 on input port index 0 for algorithm vtkPolyDataNormals(0A9B3498) is of type vtkImageData, but a vtkPolyData is required.”  How can I solve it . Please gei me a idea or suggest. 
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