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We updated from version 12 to the current version of 22.03 .
The site seems largely ok but needs a few tweaks post-upgrade,
But when I have tried to log in to the wordpress dashboard, I get
"There has been a critical error on this website. Please check your site admin email inbox for instructions."
This is with PHP v7.3 . If I revert to PHP v5.6, seems to work again.
Any advice would be greatly appreciated.