Critical Error – cannot update website

Hi, I am unable to edit my website or log in to wordpress at all. I get the error:
There has been a critical error on this website. Please check your site admin email inbox for instructions.

link:Learn more about troubleshooting WordPress

I have not received any emails from WordPress. The link to learn more is not helping resolve my issue. Please advise on what I can do because I really need to update my website today.

Thanks in advance.

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

 

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