if ( !defined(‘WP_CONTENT_URL’) )
define( ‘WP_CONTENT_URL’, get_option(‘siteurl’) . ‘/wp-content’);
I got same error at line number 116 in default-constants.php
Here is the solution.
In the line define( ‘WP_CONTENT_URL’, get_option(‘siteurl’) . ‘/wp-content’);
get_option(‘siteurl’) will return site url and which will be set to WP_CONTENT_URL and this is a string value and fetched from the option table.
so what I did, I checked siteurl option and what I found there is a json in stead of site url, I replaced that json value with siteurl and got my site back.
Hope this will help!