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Enable WP_DEBUG

WP_DEBUG is a PHP constant (a permanent global variable) that can be used to trigger the "debug" mode throughout WordPress and display error messages.

To enable the debug mode, open the wp-config.php file at the root if your WordPress installation and set the WP_DEBUG value to true.

define('WP_DEBUG', true);

You should find this line at the end of the wp-config.php file above the line that says

/* That's all, stop editing! Happy blogging. */