Error when clicking the “Customize” button in the backend

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(Awaiting approval from [Wordpress.org](https://Wordpress.org) but thought I’d post here incase anything solved it in the meantime!)

I’ve got a random issue with my website after updating the salient theme. ([Wordpress.org](https://Wordpress.org) site).

Url: [benskinnercreative.com](https://benskinnercreative.com).

My site is working correctly apart from when I go to the “Customize” section, I get the error message “There has been a critical error on this website. Please check your site admin email inbox for instructions.”

I have taken steps to fix that specific error message by manually updating the wp-config file and changing:

define ( ‘WP\_DEBUG’, false );

to

define ( ‘WP\_DEBUG’, true );

As mentioned in this YouTube tutorial vid: [https://www.youtube.com/watch?v=1zlbjQTkQ88](https://www.youtube.com/watch?v=1zlbjQTkQ88).

I’ve also manually updated the admin email address for the website as well. Neither of these steps seem to solve the issue.

Other steps I’ve taken (apart from installing a fresh install of WordPress which is my absolute last resort.

\- Tried downgrading PHP to version [7.4.33.4](https://7.4.33.4)

\- Tried updating all plugins and theme

\- Tried deactivated all plugins

\- Switched theme to see if the issue was theme specific

\- Flushing any caching plugins as well as server and/or browser caches.

\- I’ve tried viewing the error console in my browser, but only get error messages related to this “Tracking Prevention blocked access to storage for [https://secure.gravatar.com/avatar/6341aad71caf37c88fd6ff5513f08e3e?s=128&d=mm&r=g.”](https://secure.gravatar.com/avatar/6341aad71caf37c88fd6ff5513f08e3e?s=128&d=mm&r=g.”) which I’m guessing is something to do with my cookies add on.

\- I’ve installed a Health Check & Troubleshooting plugin

\- Removed inactive themes

Does anyone have any ideas? Any help would be greatly appreciated.

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