Clearing cache crashed my site

Hi there,

I’m helping manage a client’s website, and I was doing an all plugin update and then clicked the recommended clear cache, next thing I know I’m being told that the website is in maintenance mode and now is showing a critical error.

Since I can’t log in how can I fix this?

I will add that I’m a WordPress newbie. I have only really done edits and adjustments, nothing too technical.

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

 

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