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, '6709e7cf81affbf...', 0, 'batcache', 2419200)
#3 /app/public.built/wp-content/mu-plugins/redis-cache/includes/object-cache.php(63): WP_Object_Cache->add('6709e7cf81affbf...', 0, 'batcache', 0)
#4 /app/public.built/wp-content/mu-plugins/batcache/advanced-cache.php(456): wp_cache_add('6709e7cf81affbf...', 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