XF 1.5 Uninstalled UI.X but errmm help

[Exemption]

Refering to: https://xenforo.com/community/threads/weird-regristration-error.106630/#post-993983

I uninstalled UI.X to fix the problem but my theme seems to be working fine now, do I need to reinstall it again or no?

 

[Paul B]

https://xenforo.com/community/threads/where-to-obtain-support-for-third-party-styles.92673/