Dear sfepy-Experts

I'm working with python 3.10 on Ubuntu 18.04 and when I try sfepy-view navier_stokes.vtk I get the error message ValueError: Invalid style "". Must be one of the following: "surface" "wire frame" "points".

The modules were installed using:

conda create -n EM python=3.10
conda activate EM
conda install -c anaconda scipy
pip install meshio
pip install pyvista
in the sfepy root-dir.: pip install . --user

What's wrong ?

kind regards, Claus