wordpress error after changing php version

Question

Recently, I changed my WordPress PHP version to 8, but after the same, the website is not loading, showing the below error from the log
"__wakeup() must have public visibility"

Answer 1

Your current WordPress must have an element that doesn't support the PHP version, it could theme or plugin. Change the PHP version back to the previous one, take a backup of the WordPress and database, update the plugins and themes along with WordPress itself and check again

Answer 2

Refer here https://wordpress.org/support/topic/__wakeup-must-have-public-visibility/