Online Server Error

Whenever I join a server I this Couldn’t include file ‘core/e2lib.lua’ (File not found) and sometimes nil value errors. Can anyone help its only online and its every server. I have Gmod for over a 3 months now and it just started happening.

re-install.

If I do that will I lose all my addons and maps?

only if you don’t back them up.

Thank you this is the frst straight answer ive actually got.

I aim to please.