Unable to allocate memory for pool

Hi there , I just installed the plug in and i receive this error when uploading images or showing the book

Warning: include_once(): Unable to allocate memory for pool. ON LINE 90 in file /usr/local/www/vdomains/alpine.co.za/wp-content/plugins/page-flip-image-gallery/pageFlip.php

Warning: include_once(): Unable to allocate memory for pool. on line 204 in file /usr/local/www/vdomains/alpine.co.za/wp-content/plugins/page-flip-image-gallery/BOOK.class.php

PLEASE HELP

https://www.ads-software.com/plugins/page-flip-image-gallery/