Page content blank

Hi all!

So, everything was fine until i tried posting a new page and i couldn’t see it. There’s the header and menu but under that, it’s all blank, now when i try creating a new page, it’s always the same thing!

I deactivated all plugins, deleted the theme, reinstalled it. Doesn’t work, the page shows fine on other themes. And my older pages still work!

What is wrong here!!!!