Save modifies the method in the current environment. Commit does an HTTP PUT back to the webserver (which, on clamato.net, is not configured to accept PUTs, so

Save modifies the method in the current environment. Commit does an HTTP PUT back to the webserver (which, on clamato.net, is not configured to accept PUTs, so that will always error). You end up with .st files you can manage in git or anything else. You should be able to just ignore the commit errors and keep going through the tutorial, I think? But to get rid of them, just search for the "save" method, and remove the line that says "self commit", and then save it.