Update wordpress fail – There has been a critical error on your website

The error is caused because of the ‘Revolution Slider’ plugin.

The function create_function is outdated and shall be updated with the latest version.

Simply put – Update the Revolution Slider plugin through CPanel or FTP. It shall mostly solve the problem immediately.

Then you can try to see whether you are able to access the site or not.

Also as suggested perform the manual update to make sure everything is upto date – https://wordpress.org/support/article/updating-wordpress/#manual-update

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