Critical Error when logging in

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My site comes up if you visit it, but when I try to login to the dashboard I get ”There has been a critical error on this website. Please check your site admin email inbox for instructions.” (never got emails). 

If you refresh the site it will show you are logged in, but I get a critical error if I click on anything. Any ideas on how to fix this?

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

 

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