Access to vendor folder

So what do you see? You see you don’t see an error, so what do you see instead?

Do you see a blank page? If so, you may need to enable display_errors first: Http error 500

If you see something else, what do you see?

And again:

If you want to speculate about permissions or whatnot, go right ahead. But please give us the information you’re basing that on too, or we have no idea whether that speculation is accurate at all.