I.... I need help. Errors. Errors everywhere

This is my first world I ever made in Unity and I decided to add some pens.
I found QvPens for SDK3. I imported them. I got 41 of these error messages and I can’t public and test, nor build and publish. If anyone knows what is going on, please help ;-;

Looks like you didn’t include udonsharp, which is required for it to work. Import that and you should be fine. Just google udon sharp github.

pretty much ^
here’s a quick dl link: