File generated by VtkGroup can not be loaded into paraview.

[inkandvijay]

I am able to generate a perfectly good .vtu file using unstructuredGridToVTK. As a natural next step, I am using VtkGroup to combine multiple .vtu into one .pvd (along the lines of this example).While it is able to generate .pvd file without errors, the file can not be read by Paraview (version 5.11.0). Following is the error:

ERROR: In vtkXMLReader.cxx, line 305
vERROR: In vtkXMLReader.cxx, line 305
vtkXMLUnstructuredGridReader (0000015830D9A8E0): Error opening file C:/Users/vd6558/Downloads/Graphics/Raw_0_0.vtu

ERROR: In vtkExecutive.cxx, line 741
vtkCompositeDataPipeline (0000015841504AF0): Algorithm vtkXMLUnstructuredGridReader (0000015830D9A8E0) returned failure for request: vtkInformation (0000015852D91B30)
  Debug: Off
  Modified Time: 521679
  Reference Count: 1
  Registered Events: (none)
  Request: REQUEST_INFORMATION
  FORWARD_DIRECTION: 0
  ALGORITHM_AFTER_FORWARD: 1