My Scene won't load in, and is stuck in "WaitForPlayEnter"

When you press play the scene loads in (at least with my settings) and a white box appears with a green line that shows how much progress the scene has come to load in. But when I press play it just gets stuck in the first state of loading that scene up. I've waited for as long as 2 hours and it still wouldn't open. And when restarting my pc and booting up the project, the error is still there. Does this happen to you and are there any fixes?