I can't seem to reproduce your issue right away. Can you please confirm that VVVX_disk/ is a directory located at the same level as your notebook file? I.e., from the notebook, in a new cell, you should be able to do
Does that work?
Or is the VVVX_disk/ directory maybe on your VOSpace? Then you would have to import like this:
Let us know if this helped. Otherwise, we will dig deeper.