Fatal error: Uncaught DOMException: Invalid Character Error in /var/app/vendor/querypath/querypath/src/QueryPath/DOMQuery.php:509 Stack trace: #0 /var/app/vendor/querypath/querypath/src/QueryPath/DOMQuery.php(509): DOMElement->setAttribute() #1 /var/app/vendor/lullabot/amp/src/Pass/IframeYouTubeTagTransformPass.php(174): QueryPath\DOMQuery->attr() #2 /var/app/vendor/lullabot/amp/src/Pass/IframeYouTubeTagTransformPass.php(92): Lullabot\AMP\Pass\IframeYouTubeTagTransformPass->setYouTubeAttributesFrom() #3 /var/app/vendor/lullabot/amp/src/AMP.php(450): Lullabot\AMP\Pass\IframeYouTubeTagTransformPass->pass() #4 /var/app/models/googleamp/news.php(57): Lullabot\AMP\AMP->convertToAmpHtml() #5 /var/app/models/googleamp.php(5): require_once('/var/app/models...') #6 /var/app/index.php(189): require_once('/var/app/models...') #7 {main} thrown in /var/app/vendor/querypath/querypath/src/QueryPath/DOMQuery.php on line 509