Error when installing Gon WordPress theme

Question

I find Gon WordPress theme on the internet and do as a guide. When I click Import button, errors occurred

Answer 1

This's just a warning from PHP for debugging purpose. You can hide it if you want, but you should fix until there's no warning left.

On your production, first you should hide this info by change WP_DEBUG to false in wp-config.php or replace that line with below code:

ini_set('display_errors','Off');
ini_set('error_reporting', E_ALL );
define('WP_DEBUG', false);
define('WP_DEBUG_DISPLAY', false);

If this is your testing environment, you should contact theme provider to fix this issue. May be PHP version incompatible or the error that theme's author not seen this before.