Fatal error: Uncaught Error: Call to undefined method WP_Error::has_errors() in /var/www/vhosts/solon.org.gr/httpdocs/wp-admin/includes/file.php:1805 Stack trace: #0 /var/www/vhosts/solon.org.gr/httpdocs/wp-content/plugins/so-widgets-bundle/base/siteorigin-widget.class.php(786): WP_Filesystem() #1 /var/www/vhosts/solon.org.gr/httpdocs/wp-content/plugins/so-widgets-bundle/base/siteorigin-widget.class.php(282): SiteOrigin_Widget::clear_file_cache() #2 /var/www/vhosts/solon.org.gr/httpdocs/wp-content/plugins/so-widgets-bundle/so-widgets-bundle.php(781): SiteOrigin_Widget->generate_and_enqueue_instance_styles(Array) #3 /var/www/vhosts/solon.org.gr/httpdocs/wp-includes/class-wp-hook.php(286): SiteOrigin_Widgets_Bundle->enqueue_active_widgets_scripts('') #4 /var/www/vhosts/solon.org.gr/httpdocs/wp-includes/class-wp-hook.php(310): WP_Hook->apply_filters(NULL, Array) #5 /var/www/vhosts/solon.org.gr/httpdocs/wp-includes/plugin.php(453): WP_Hook->do_action(Array) #6 /var/www/vhosts/solon.org.gr/httpdocs/wp-includes/script-loader.ph in /var/www/vhosts/solon.org.gr/httpdocs/wp-admin/includes/file.php on line 1805