Problems after installing SkinSystem

After I successfully installed SkinSystem, people accessing the site would keep getting stuck on the site loading page and could not access the site. (This only happens after properly configuring MySQL).

This is the error log
![IMG_20230121_114354](https://user-images.githubusercontent.com/87133530/213842022-43f23706-262f-4b0a-94c3-b68d7246aa7b.jpg)

Is there a way to fix it?