I suddenly got this error on my site logs yesterday:
PHP Fatal error: Uncaught Error: Call to undefined function get_field() in /srv/htdocs/wp-content/themes/chouhdrie/template-parts/header-navigation.php:11
Everything had been working fine until I noticed that a single page had a critical error notice in the dashboard. So I visited it on the public URL and it crashed, followed by all the other pages. I tried changing the PHP version to see if I could get anywhere and rolling it back to 7.4 let me get to the dashboard where I was able to change the theme to a WordPress standard one.
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Rename your theme folder.