Backtrace:
#0 /vagrant/mediawiki/includes/Rest/Router.php(293): MWParsoid\Rest\Handler\TransformHandler->execute()
#1 /vagrant/mediawiki/includes/Rest/Router.php(280): MediaWiki\Rest\Router->executeHandler(MWParsoid\Rest\Handler\TransformHandler)
#2 /vagrant/mediawiki/includes/Rest/EntryPoint.php(65): MediaWiki\Rest\Router->execute(MediaWiki\Rest\RequestFromGlobals)
#3 /vagrant/mediawiki/includes/Rest/EntryPoint.php(53): MediaWiki\Rest\EntryPoint->execute()
#4 /vagrant/mediawiki/rest.php(29): MediaWiki\Rest\EntryPoint::main()
#5 /var/www/w/rest.php(5): require(string)
#6 {main}