Twig\Error\RuntimeError thrown

An exception has been thrown during the rendering of a template ("Failed to write cache file "/nas/content/live/butterflyprod/wp-content/cache/gantry5/rt_protean/twig/1c/1c8d28d45f0d693b22f1ff263fd8b556a9097078f60e28ba1c0f77940172fb06.php".").