Red Bar on plugins page

So, On the plugins page, i cant see any of them. There is only a red bar that says "File Not Found"

Is there any way i can fix this?

Quote from Adriel

You need a server software that supports plugins installed.

Vanilla doesn't support plugins.

Switch to Paper or Purpur on the software page.

i did that and it doent work

Quote from Adriel

That's because you didn't.

oh :skull:

i kept trying an it wasnt working lol

now i know why