extractSummary twig filter is unknown
So it sounds to me like either the plugin isn't installed (which doesn't make a ton of sense, because you'd be getting other errors, too), or if it is installed, pieces of it are missing.

extractSummary is a Twig filter/function and has been available since the start; I'd try making sure there's nothing wrong with your install/deploy, or try re-downloading a fresh copy of the SEOmatic plugin.