Testing the classifier error

Welcome to the forum @arielmarie2194!

Something else installed in your qiime2-2020.2 environment must have caused your scikit-learn version to upgrade.

See this post for info on downgrading: Feature classifier for the moving pictures tutorial doesn't work with latest version of scikit-learn 0.20.3 - #2 by Nicholas_Bokulich

Looks like that topic also has some links to tutorials for training your own classifier, which is another way to bypass this error (train and classify with the same version).

Good luck!