Fatal error: Uncaught TypeError: call_user_func_array(): Argument #1 ($callback) must be a valid callback, non-static method WS_real_estate_floor::init() cannot be called statically in /data01/virt12618/domeenid/www.fundehitus.ee/htdocs/priisletee2/wp-includes/class-wp-hook.php:303 Stack trace: #0 /data01/virt12618/domeenid/www.fundehitus.ee/htdocs/priisletee2/wp-includes/class-wp-hook.php(327): WP_Hook->apply_filters(NULL, Array) #1 /data01/virt12618/domeenid/www.fundehitus.ee/htdocs/priisletee2/wp-includes/plugin.php(470): WP_Hook->do_action(Array) #2 /data01/virt12618/domeenid/www.fundehitus.ee/htdocs/priisletee2/wp-settings.php(578): do_action('init') #3 /data01/virt12618/domeenid/www.fundehitus.ee/htdocs/priisletee2/wp-config.php(97): require_once('/data01/virt126...') #4 /data01/virt12618/domeenid/www.fundehitus.ee/htdocs/priisletee2/wp-load.php(50): require_once('/data01/virt126...') #5 /data01/virt12618/domeenid/www.fundehitus.ee/htdocs/priisletee2/wp-blog-header.php(13): require_once('/data01/virt126...') #6 /data01/virt12618/domeenid/www.fundehitus.ee/htdocs/priisletee2/index.php(17): require('/data01/virt126...') #7 {main} thrown in /data01/virt12618/domeenid/www.fundehitus.ee/htdocs/priisletee2/wp-includes/class-wp-hook.php on line 303