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Hello again, now after activating the AIO SEO plugin, the admin part went blank. Please help again

I have started getting error after the update and my complete website went blank till the time I deleted All in one seo pack using filezilla

PHP Fatal error: Call to undefined function boolval() in /home/xxxxxxxx/public_html/wp-content/plugins/all-in-one-seo-pack/aioseop_class.php on line 4407

Please help