Hi,
This is just a notice and can be safely ignored. They shouldn’t however be printed on the front-end as a matter of security. You can do this by editing wp-config.php in your main WordPress folder and adding the following
COPY CODE
define('WP_DEBUG', true);
define('WP_DEBUG_LOG', true);
define('WP_DEBUG_DISPLAY', false);
Make sure these are not already defined in your wp-config.php file. If they are then change the WP_DEBUG_DISPLAY that is already present to false.
https://codex.wordpress.org/Debugging_in_WordPress
Thanks,
Kieran
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