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TexturePath should be initialized with "./" instead of "." otherwise one should add "/" in MTL file which is not compatible with Blender or Meshlab for instance

map_Kd /bakeGroundCorrected.png

Code to change

vtkOBJPolyDataProcessor::vtkOBJPolyDataProcessor()
{
  // Instantiate object with nullptr filename, and no materials yet loaded.
  this->FileName = "";
  this->MTLFileName = "";
  this->DefaultMTLFileName = true;
  this->TexturePath = ".";
  this->VertexScale = 1.0;
  this->SuccessParsingFiles = 1;
  this->SetNumberOfInputPorts(0);
  /** multi-poly-data paradigm: pivot based on named materials */
  vtkOBJImportedPolyDataWithMaterial* default_poly = (new vtkOBJImportedPolyDataWithMaterial);
  poly_list.push_back(default_poly);
  this->SetNumberOfOutputPorts(static_cast<int>(poly_list.size()));
}

Error reported