@futurebird My employer at the ISP I worked for in the 90s used to say that, "Working with computers requires a huge ego. The computer is always telling you that YOU ARE WRONG."
The thing you're trying to teach is harder because it's two things at the same time: Learning how the language parser reports errors. The student learning to debug how they think.
I've been coding for years. Parser errors are hard enough and are often obscure in some languages.