Critical error on admin page

I’m having a problem on accessing our admin page, everytime I logged-in it says “There has been a critical error on this website. Please check your site admin email inbox for instructions.” BUT the email admin didn’t receive any instructions or anything from WORDPRESS. I hope someone can help me to resolve this problem as I need to change lots of information especially on our home page.

The page I need help with: [log in to see the link]