Error 500 and error 404

I got error 500 when all plugins activated.I got elementor plugin 404 Oops… Page Not Found! when all plugin deativated.Same problem in both multisites and single site

I got this error in server log

[03-Feb-2019 20:10:56 UTC] PHP Warning: Error while sending QUERY packet. PID=27312 in /home/projecto/public_html/57deal.com/wp-includes/wp-db.php on line 1924

Please check

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