why R give me an ERROR

i try to make ANOVA. I insert data, but R don't find it, why? i'm new so i use R very few times. Someone can Help me?

https://preview.redd.it/lg3rxcshphdd1.png?width=750&format=png&auto=webp&s=19ddab06b496f39c139c0bf398c0103a5ed18468