Is it possible the file permissions on your server has changed? Perhaps you’ve switched hosting or your host has done some updating.
Make sure the file permissions are 755 on the acf-json folder and that ACF has the ability to write to it.
You could also activate WP debug and see if there’s any information coming from that. Put this in your wp-config.php file:
// Turns WordPress debugging on define('WP_DEBUG', true); // Tells WordPress to log everything to the /wp-content/debug.log file define('WP_DEBUG_LOG', true); // Doesn't force the PHP 'display_errors' variable to be on define('WP_DEBUG_DISPLAY', false); // Hides errors from being displayed on-screen @ini_set('display_errors', 0);
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