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Fatal error: Uncaught Error: Call to undefined function wp_optimize_minify_config() in /htdocs/wp-content/plugins/wp-optimize-premium/includes/class-wpo-page-optimizer.php:61 Stack trace: #0 /htdocs/wp-content/plugins/wp-optimize-premium/includes/class-wpo-page-optimizer.php(26): WPO_Page_Optimizer->maybe_remove_unused_css('<!doctype html>...') #1 [internal function]: WPO_Page_Optimizer->optimize('<!doctype html>...', 9) #2 /htdocs/wp-includes/functions.php(5471): ob_end_flush() #3 /htdocs/wp-includes/class-wp-hook.php(324): wp_ob_end_flush_all('') #4 /htdocs/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters(NULL, Array) #5 /htdocs/wp-includes/plugin.php(517): WP_Hook->do_action(Array) #6 /htdocs/wp-includes/load.php(1304): do_action('shutdown') #7 [internal function]: shutdown_action_hook() #8 {main} thrown in /htdocs/wp-content/plugins/wp-optimize-premium/includes/class-wpo-page-optimizer.php on line 61