I am an absolute beginner, and right after i opened my first project and add an actor i see this many errors out of nowhere, is there a problem with the setup?
Those are intellisense errors and you can ignore them. Intellisense doesn’t work well with large codebases or complex macros.
Epic recommends disabling the Error List entirely:
https://docs.unrealengine.com/en-US/…tup/index.html