PHP Error [8192]

Creation of dynamic property App::$db is deprecated (/home/l/l91913qn/bizon.mamazonka.ru/public_html/ideal/classes/App.php:14)

#0 /home/l/l91913qn/bizon.mamazonka.ru/public_html/ideal/classes/Singleton.php(20): getInstance()
#1 /home/l/l91913qn/bizon.mamazonka.ru/public_html/main.php(9): gI()