You are correct, it works! I am on a Mac and I needed to press F3 (show all windows) to see the graphics window. It does not show up if you just do cmd-Tab.
As for the second error - I was incorrectly trying to run the core.clj, so no problem there.
Thanks for the help! I had fun drawing circles :))
This is truly great. I was looking for some introduction to programming for my little kid, and I wanted it to be very flexible but also visual, and I think this just the right tool.
I ran into a problem though. I can run the commands in the REPL and I can see the new turtle position in the terminal, but there is no quil window with graphics. I can also run the example function, but I get "quil.Applet cannot be cast to clojure.lang.IFn".
As for the second error - I was incorrectly trying to run the core.clj, so no problem there.
Thanks for the help! I had fun drawing circles :))