Cannot access back end of staging site

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I have created a staging site to give tech support the ability to troubleshoot a problem we are having with our live site.

I can access every page of our staging site, but as soon as I try to access the back end, it gives me a critical error message:

“There has been a critical error on this website. Please check your site admin email inbox for instructions.

Learn more about troubleshooting WordPress.

The whole site works, and the top admin bar is there, but if I click on anything in the admin bar, it gives me that message.

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

 

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