Hi Ben,
from the file path given in your error message I asume you are running Julia on Windows OS.
Which package do you want to use for plotting? I had a lot of trouble with the Python-related/-dependent packages as well, because I don’t have Python installed.
As I am using Juno (from JuliaPro) I found it easier to use PlotlyJS (Java Script-based plotting).
Would that be an option for you as well?
Best
Moses