a word that is not defined - The message that pops up when you forget to use the word in

The message that pops up when you forget to use the word in your example, which is the worst thing you can do

I forgot to use the word in my example. The message popped up. It was the worst thing ever.

You didn’t use the word in the example. The message came up. It was the worst thing ever.

The message said I didn’t use the word. That was the worst thing ever.