Error message in vtkGradientFilter
RROR: In /projects/viz/paraview/src/ParaView/5.4.0-sb/ParaView5/VTK/Filters/General/vtkGradientFilter.cxx, line 269 vtkGradientFilter (0x2dad320): No input array.
ERROR: In /projects/viz/paraview/src/ParaView/5.4.0-sb/ParaView5/VTK/Common/ExecutionModel/vtkExecutive.cxx, line 784 vtkPVCompositeDataPipeline (0x2db00c0): Algorithm vtkGradientFilter(0x2dad320) returned failure for request: vtkInformation (0x4a2c830) Debug: Off Modified Time: 901921 Reference Count: 1 Registered Events: (none) Request: REQUEST_DATA FROM_OUTPUT_PORT: 0 ALGORITHM_AFTER_FORWARD: 1 FORWARD_DIRECTION: 0