When I click "run" on the top, I'm getting an error message on the right "... sent an invalid response." what is the reason for this?

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@SalladShooter Here’s the a link to the fork: https://replit.com/@XaviRamirez/docs-matplotlib

Great news it seems to work now! The previous issues were that it seemed stuck on the “Migrating to Nix” step for >20mins and when that finished, the output didn’t work.

As for the original problem, it seems to happen to pretty much every HTML/JS/CSS repl.it I stumble across. For example: https://replit.com/@yevbar/Website-Workshop1

Same issue:
image