ERROR: In E:\Cmake\VTK\VTK-6.2.0\Common\ExecutionModel\vtkDemandDrivenPipeline.cxx, line 710
vtkCompositeDataPipeline (04F06520): Input port 0 of algorithm vtkImageMapToWindowLevelColors(04EFD2C0) has 0 connections but is not optional.
以上是错误信息