Fatal error: Uncaught Error: Class 'WP_Widget_Custom_HTML' not found in /home/w13/domains/muzeum.radomsko.pl/public_html/wp-includes/class-wp-widget-factory.php:62
Stack trace:
#0 /home/w13/domains/muzeum.radomsko.pl/public_html/wp-includes/widgets.php(115): WP_Widget_Factory->register('WP_Widget_Custo...')
#1 /home/w13/domains/muzeum.radomsko.pl/public_html/wp-includes/widgets.php(1849): register_widget('WP_Widget_Custo...')
#2 /home/w13/domains/muzeum.radomsko.pl/public_html/wp-includes/class-wp-hook.php(324): wp_widgets_init('')
#3 /home/w13/domains/muzeum.radomsko.pl/public_html/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters(NULL, Array)
#4 /home/w13/domains/muzeum.radomsko.pl/public_html/wp-includes/plugin.php(517): WP_Hook->do_action(Array)
#5 /home/w13/domains/muzeum.radomsko.pl/public_html/wp-settings.php(643): do_action('init')
#6 /home/w13/domains/muzeum.radomsko.pl/public_html/wp-config.php(90): require_once('/home/w13/domai...')
#7 /home/w13/domains/muzeum.radomsko.pl/public_html/wp-load.php(50): r in /home/w13/domains/muzeum.radomsko.pl/public_html/wp-includes/class-wp-widget-factory.php on line 62
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