I have a slightly different approach to most others, but your choice if you want to follow it.
Rather than fucking around and backwards and forwards. (I personally find a fresh build faster than a fault find)
and yes, I know you’ve just done this but I suggest you delete EVERYTHING including folders and I start Fresh.
Follow the guide through I will link shortly.
Go through step-by-step and stop when you get an error. If you do (you shouldn’t) then reply to this post.
It is easier to diagnose as you work through.
As long as you followed the guide exactly everything should work
Here’s my abridged guide, Stolen from, but linked to Amals very thorough guide.
I have used my own guide a few times and never had an issue.
Follow it to the letter, and you SHOULD be fine.
FYI
The Button Trick