Hey there Chadjana, I have the same problem (for the second time this week), the first time around I tried everything and nothing seemed to do it so I took a back up I had a few weeks older took the whole site back to set up stage and re setup the databases, this took care of the problem for a few days yesterday night the error came back, I thought It was a plug in problem but I have reset and updated all the plug ins and nothing, I took a fresh copy of my theme AND NOTHING…
I have searched around a quite a few sites are being affected (all wordpress sites)the html 5 sites i have in the same host are not affected.
Please let me know if you have worked out what it might be.
A few of my sites that are down:
https://designstudios.mx/
https://myhealthyvacation.com/
Cheers