Error 522 on my web site

My web site has few visitors - not much.
Yesterday is was ok with cloudflare.
But today i got Error 522.
Here is the error image :
Error 522
And here is web site :

What is the problem & how can i fix it?

I called my hosting provider & they told problem is from cloudflare side not us.

Of course they said that. 99% of the time, it really is them. They’re just too lazy to troubleshoot the problem. Here are instructions:

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