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Fatal error: Uncaught Error: Call to undefined method Ressio_HtmlOptimizer_Dom_Element::addChild() in /var/www/vhosts/infopelis.com/httpdocs/wp-content/plugins/psn-pagespeed-ninja/ress/classes/htmloptimizer/dom.php:182 Stack trace: #0 /var/www/vhosts/infopelis.com/httpdocs/wp-content/plugins/psn-pagespeed-ninja/ress/classes/plugin/widgets/widgets.php(66): Ressio_HtmlOptimizer_Dom->appendScriptDeclaration('!function(e,t,n...', Array, Object(Ressio_HtmlOptimizer_Dom_Element)) #1 /var/www/vhosts/infopelis.com/httpdocs/wp-content/plugins/psn-pagespeed-ninja/ress/classes/plugin/widgets/widgets.php(142): Ressio_Plugin_Widgets->injectJsLoader(Object(Ressio_HtmlOptimizer_Dom), Object(Ressio_HtmlOptimizer_Dom_Element)) #2 /var/www/vhosts/infopelis.com/httpdocs/wp-content/plugins/psn-pagespeed-ninja/ress/classes/dispatcher.php(117): Ressio_Plugin_Widgets->onHtmlIterateTagSCRIPTBefore(Object(Ressio_Event), Object(Ressio_HtmlOptimizer_Dom), Object(Ressio_HtmlOptimizer_Dom_Element)) #3 /var/www/vhosts/infopelis.com/httpdocs/wp-content in /var/www/vhosts/infopelis.com/httpdocs/wp-content/plugins/psn-pagespeed-ninja/ress/classes/htmloptimizer/dom.php on line 182