Fatal error: Uncaught Error: Call to undefined function json_encode() in /usr/local/www/wordpress/wp-includes/functions.php:3820 Stack trace: #0 /usr/local/www/wordpress/wp-includes/widgets/class-wp-widget-text.php(58): wp_json_encode('text') #1 /usr/local/www/wordpress/wp-includes/class-wp-widget.php(260): WP_Widget_Text->_register_one() #2 /usr/local/www/wordpress/wp-includes/class-wp-widget-factory.php(112): WP_Widget->_register() #3 /usr/local/www/wordpress/wp-includes/class-wp-hook.php(288): WP_Widget_Factory->_register_widgets('') #4 /usr/local/www/wordpress/wp-includes/class-wp-hook.php(312): WP_Hook->apply_filters(NULL, Array) #5 /usr/local/www/wordpress/wp-includes/plugin.php(478): WP_Hook->do_action(Array) #6 /usr/local/www/wordpress/wp-includes/widgets.php(1765): do_action('widgets_init') #7 /usr/local/www/wordpress/wp-includes/class-wp-hook.php(288): wp_widgets_init('') #8 /usr/local/www/wordpress/wp-includes/class-wp-hook.php(312): WP_Hook->apply_filters(NULL, Array) #9 /usr/local/www/wordpress/wp-includes/pl in /usr/local/www/wordpress/wp-includes/functions.php on line 3820