Fatal error: Uncaught Error: Class 'WP_Customize_Control' not found in /home/wmichal67/public_html/lekcjatest-1v-mw/wp-content/themes/sydney/inc/customizer/controls/responsive-slider/class_sydney_responsive_slider.php:2 Stack trace: #0 {main} thrown in /home/wmichal67/public_html/lekcjatest-1v-mw/wp-content/themes/sydney/inc/customizer/controls/responsive-slider/class_sydney_responsive_slider.php on line 2