@mar-co said in new users, one error plotting:

This call to matplotlib.use() has no effect because the backend has already
been chosen; matplotlib.use() must be called before pylab, matplotlib.pyplot,
or matplotlib.backends is imported for the first time

It would seem you already made a call to matplotlib or imported something. Or you are running inside an environment which does it for you.

Or read this:

https://community.backtrader.com/topic/772/better-matplotlib-support-in-jupyter/