You need to enable your debug log to know actual problem on your site.
Enable Debug log from your site though below steps:
- Open
wp-config.phpfrom your WordPress setup. -
Add below lines
define( ‘WP_DEBUG’, true );
define( ‘WP_DEBUG_LOG’, true );
define( ‘WP_DEBUG_DISPLAY’, true );
And just refresh the page.
Now you can see the error message’s and warnings behind your problem.
For more information @see https://codex.wordpress.org/Debugging_in_WordPress
So, You know the actual reason of why functions.php not working on your site.
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