Hi @ErikaGanda, it looks like you might be running on a headless machine (as in, no monitor connected)? If so, you need to configure your matplotlib backend to use a renderer that supports headless operations (e.g. Agg):
echo "backend: Agg" > ~/.config/matplotlib/matplotlibrc
Please note, if this is in fact a headless machine, qiime tools view will not work for viewing your QZV files (because there is no display to use!), so please consider one of the alternatives linked to here:
Let us know if that works for you! Thanks!