I had this issue too, I can't comment on the error screen, I just had to reload a save, but the burger situation isn't actually a bug, it's just not super clear the order.
When you make the burgers, you put them in order like you're reading them top to bottom. So bun onion cheese bun is the onion below the cheese. Threw me off for a bit, but once I figured that out, the minigame went smoothly.