These errors/warnings are not related to your project, they are coming from UE5 folder.
Please try this, I recommend you go through it all, but the link provided has an anchor to the possible solution:
Take this with a grain of salt, as I am still learning, but there is a little button on those that will very quickly make the files needed to fix them. Not sure whether that will help, but it only takes a few seconds and it can’t hurt.
5.6.0 preview, new project… same problem. this is now almost two weeks wasted on this rubbish. i really can’t do anything while my IDE is relegated to being as useful as notepad…
I too am having this issue on 5.5.4 with that exact error list 42 errors all listed just like the original pic. Very annoying. I’m just trying to setup my GAS Attributes…