Http error 500 wp-admin


I have a problem with /wp-admin.
I can not access. One hour it gives “HTTP ERROR 500” and another hour There is a critical error on your site. Check your email for instructions".

Can someone help me?
The websites are:

I am afraid this is an error which is straight from your web server, so you will need to talk to your web developer or your host, Cloudflare is not involved here.

Ok, thank you!

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