Can't change my CPanel theme

[randomp4]

I've changed my CPanel theme and I can't change it back. I have the SAME problem as this guy:
https://x10hosting.com/community/threads/cant-change-theme-back-to-default.200547/

Word for word exactly. Can somebody please change it back?! Thankyou in advance!

 

[randomp4]

Can an admin seriously not change my page? It's the same exact problem as the guy above.