problem with file vtk

Hi everyone, I’m having problems with the interface between ParaView and vtk.
(I’m working with macOS operating system on mac with M1 processor)
In particular, starting from 2 files, meshR.vtu and Dxx.mhd, I have to build a third meshDxx.vtu which associates the values of the tensor built in Dxx.mhd to the meshR.
Following a guide given to me, I ran the following command:
(base) Mac:Anima_data lorenzomarta$ vmtk -ifile meshR.vtu -diffusionmapfile Dxx.mhd -diffusionarray "Dxx_labels" -ofile meshDxx.vtu

and I get the following output:

Automatic piping myvmtkmeshDlabeling
Parsing options myvmtkmeshDlabeling
    MeshInInputFileName = meshR.vtu
    DiffusionMapInputFileName = Dxx.mhd
    DiffusionArrayName = Dxx_labels
    MeshOutOutputFileName = meshDxx.vtu
Explicit piping myvmtkmeshDlabeling
Input myvmtkmeshDlabeling members:
    Id = 0
    Disabled = 0
    MeshIn = None
    MeshInInputFileName = meshR.vtu
    DiffusionMap = None
    DiffusionMapInputFileName = Dxx.mhd
    DiffusionArrayName = Dxx_labels
    Correction = 0
    Radius = 9
    OnlyNegatives = 0
    MeshOutOutputFileName = meshDxx.vtu
Reading VTK XML mesh file.
ERROR: In ../IO/XML/vtkXMLReader.cxx, line 271
vtkXMLUnstructuredGridReader (0x7f860bf29ac0): Error opening file meshR.vtu

ERROR: In ../Common/ExecutionModel/vtkExecutive.cxx, line 784
vtkCompositeDataPipeline (0x600003f88000): Algorithm vtkXMLUnstructuredGridReader(0x7f860bf29ac0) returned failure for request: vtkInformation (0x600001192280)
  Debug: Off
  Modified Time: 136
  Reference Count: 1
  Registered Events: (none)

Spacing 0.449219 0.449219 0.900000
Origin -105.647736 -123.984390 -68.281136
Dimensions 448 512 176
Executing myvmtkmeshDlabeling ...
Creating points location array
Assigning diffusion values to tethraedrical mesh
---Negative diffusion values found when mapping to 3D mesh:  0
---Null diffusion values found when mapping to 3D mesh:  0
Done executing myvmtkmeshDlabeling.
Writing VTK XML mesh file.
Output myvmtkmeshDlabeling members:
    Id = 0
    MeshOut = vtkUnstructuredGrid

I don’t understand what the 2 errors that pop up depend on.
The meshDxx.vtu file in paraview does not allow me to view anything and gives me an error signal.

This looks like a question about vmtk. Perhaps they have a support forum where you can ask this question? This is for questions having to do with just VTK.