dokuwiki\Exception\FatalException: Unparenthesized `a ? b : c ? d : e` is not supported. Use either `(a ? b : c) ? d : e` or `a ? b : (c ? d : e)`

An unforeseen error has occured. This is most likely a bug somewhere. It might be a problem in the html5video plugin.

More info has been written to the DokuWiki error log.