Color Theme in Adobe illustrator is unavailable

Hey! 🙂 

I'm a first-time user of Adobe Illustrator, and I have access to it through my school's program. I tried to use the color theme tool and it said it was unavailable; I'm not sure whether it's not working because I don't have access from my school or if there's a problem. I can't contact Adobe because it's a school account, but I'm on summer break and can't contact the school.

It would be great if someone could assist me.

Thank you very much!