Fatal error: Uncaught Error: Undefined constant "WP_LANG_DIR" in /app/public.built/wp-content/mu-plugins/redis-cache/includes/object-cache.php:2973 Stack trace: #0 /app/public.built/wp-content/mu-plugins/redis-cache/includes/object-cache.php(2957): WP_Object_Cache->show_error_and_die(Object(Predis\Response\ServerException)) #1 /app/public.built/wp-content/mu-plugins/redis-cache/includes/object-cache.php(1433): WP_Object_Cache->handle_exception(Object(Predis\Response\ServerException)) #2 /app/public.built/wp-content/mu-plugins/redis-cache/includes/object-cache.php(1208): WP_Object_Cache->add_or_replace(true, '0b86f3809c8132a...', 0, 'batcache', 2419200) #3 /app/public.built/wp-content/mu-plugins/redis-cache/includes/object-cache.php(63): WP_Object_Cache->add('0b86f3809c8132a...', 0, 'batcache', 0) #4 /app/public.built/wp-content/mu-plugins/batcache/advanced-cache.php(456): wp_cache_add('0b86f3809c8132a...', 0, 'batcache') #5 /app/public.built/wp-settings.php(97): include('/app/public.bui...') #6 /app/public.built/wp-config.php(257): require_once('/app/public.bui...') #7 /app/public.built/wp-load.php(50): require_once('/app/public.bui...') #8 /app/public.built/wp-blog-header.php(13): require_once('/app/public.bui...') #9 /app/public.built/index.php(17): require('/app/public.bui...') #10 {main} thrown in /app/public.built/wp-content/mu-plugins/redis-cache/includes/object-cache.php on line 2973