Fatal error: Uncaught Error: Undefined class constant 'WPForms\Frontend\CSSVars::CONTAINER_SHADOW_SIZE' in /var/www/html/wp-content/plugins/wpforms-lite/src/Integrations/Loader.php:96 Stack trace: #0 /var/www/html/wp-content/plugins/wpforms-lite/src/Integrations/Loader.php(57): WPForms\Integrations\Loader->register_class() #1 /var/www/html/wp-content/plugins/wpforms-lite/src/Integrations/Loader.php(22): WPForms\Integrations\Loader->__construct() #2 /var/www/html/wp-includes/class-wp-hook.php(324): WPForms\Integrations\Loader::get_instance() #3 /var/www/html/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters() #4 /var/www/html/wp-includes/plugin.php(517): WP_Hook->do_action() #5 /var/www/html/wp-content/plugins/wpforms-lite/src/WPForms.php(282): do_action() #6 /var/www/html/wp-includes/class-wp-hook.php(324): WPForms\WPForms->objects() #7 /var/www/html/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters() #8 /var/www/html/wp-includes/plugin.php(517): WP_Hook->do_action() #9 /var/www/html/wp-settings.php(550) in /var/www/html/wp-content/plugins/wpforms-lite/src/Integrations/Loader.php on line 96