This is exactly my experience, every time! If I offer it the slightest bit of context it will say 'Ah! I understand now! Yes, that is your problem, …' and proceed to spit out some non-existent function, sometimes the same one it has just suggested a few prompts ago which we already decided doesn't exist/work. And it just goes on and on giving me 'solutions' until I finally realise it doesn't have the answer (which it will never admit unless you specifically ask it to – forever looking to please) and give up.