Hi Igwe,
Thanks for contacting us.
We are not able to replicate this issue on our test site. We also set WP_DEBUG to true for this.
There is a JSON file which is located in our server to push updates to a plugin, It seems like your site is blocking access this file.
What you can do?
As this is a notice and not an Error or Warning, you can safely ignore this notice or you can disable this from showing. Just open your wp-config.php file and set WP_DEBUG to false. For example ” define( ‘WP_DEBUG’, false ); ”
Best Regards