Fatal error: Uncaught TypeError: call_user_func_array(): Argument #1 ($callback) must be a valid callback, non-static method ts3_wp_viewer::init() cannot be called statically in /usr/www/websiteserver/public/KOG/wp-includes/class-wp-hook.php:287
Stack trace:
#0 /usr/www/websiteserver/public/KOG/wp-includes/class-wp-hook.php(311): WP_Hook->apply_filters()
#1 /usr/www/websiteserver/public/KOG/wp-includes/plugin.php(484): WP_Hook->do_action()
#2 /usr/www/websiteserver/public/KOG/wp-includes/widgets.php(1795): do_action()
#3 /usr/www/websiteserver/public/KOG/wp-includes/class-wp-hook.php(287): wp_widgets_init()
#4 /usr/www/websiteserver/public/KOG/wp-includes/class-wp-hook.php(311): WP_Hook->apply_filters()
#5 /usr/www/websiteserver/public/KOG/wp-includes/plugin.php(484): WP_Hook->do_action()
#6 /usr/www/websiteserver/public/KOG/wp-settings.php(557): do_action()
#7 /usr/www/websiteserver/public/KOG/wp-config.php(90): require_once('...')
#8 /usr/www/websiteserver/public/KOG/wp-load.php(37): require_once('...')
#9 /usr/www/websiteserver/public/KOG/wp-blog-header.php(13): require_once('...')
#10 /usr/www/websiteserver/public/KOG/index.php(17): require('...')
#11 {main}
thrown in /usr/www/websiteserver/public/KOG/wp-includes/class-wp-hook.php on line 287
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