>"Here's the code, bro. Trust me, it works."
>"Um, Mr. AI, I don't think your functions actually exist."
>"You're absolutely correct and what a sharp eye you have! Here's are the actually correct functions."
>*sounds of everything working perfectly intensify*

It's like the AI is testing you, trying to gauge the level of bullshit it can get away with. There's no other explanation why it doesn't test the existence of its functions BEFORE it writes a script.