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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/lazyload/lazyload.php(224): Ressio_HtmlOptimizer_Dom->appendScriptDeclaration('!function(e,t,n...', Array) #1 /var/www/vhosts/infopelis.com/httpdocs/wp-content/plugins/psn-pagespeed-ninja/ress/classes/dispatcher.php(117): Ressio_Plugin_Lazyload->onHtmlIterateTagBODYAfter(Object(Ressio_Event), Object(Ressio_HtmlOptimizer_Dom), Object(Ressio_HtmlOptimizer_Dom_Element)) #2 /var/www/vhosts/infopelis.com/httpdocs/wp-content/plugins/psn-pagespeed-ninja/ress/classes/htmloptimizer/dom.php(852): Ressio_Dispatcher->triggerEvent('HtmlIterateTagB...', Array) #3 /var/www/vhosts/infopelis.com/httpdocs/wp-content/plugins/psn-pagespeed-ninja/ress/classes/htmloptimizer/dom.php(872): Ressio_HtmlOptimizer_Dom->dom in /var/www/vhosts/infopelis.com/httpdocs/wp-content/plugins/psn-pagespeed-ninja/ress/classes/htmloptimizer/dom.php on line 182