[vtkusers] No override found for 'vtkRayCastImageDisplayHelper'

[Rasoul Sharifian]

Hi every one,
Do you guys face with this error?

Generic Warning: In
F:\VTK-8.1.0\Source\Rendering\Volume\vtkRayCastImageDisplayHelper.cxx,
line 20
Error: no override found for '*vtkRayCastImageDisplayHelper*'.

It occurs at this line of my code:

vtkSmartPointer<vtkFixedPointVolumeRayCastMapper> mapper =
        vtkSmartPointer<vtkFixedPointVolumeRayCastMapper>::New();

Any help would be welcome
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