Unexpected error!

Call to undefined function App\Handlers\Utils\system(). We are notified and will solve the problem as soon as possible.

#0 /home/vpohid/domains/vpohid.com.ua/app/Handlers/Utils/Images.php(512): App\Handlers\Utils\Images->makeThumbnailCLIM() #1 /home/vpohid/domains/vpohid.com.ua/app/Handlers/Utils/Images.php(457): App\Handlers\Utils\Images->makeThumbnail() #2 /home/vpohid/domains/vpohid.com.ua/app/Handlers/Community/Comments.php(770): App\Handlers\Utils\Images->getImageFilePath() #3 /home/vpohid/domains/vpohid.com.ua/app/Controllers/Comments.php(101): App\Handlers\Community\Comments->getPhotoFilePath() #4 /home/vpohid/domains/vpohid.com.ua/src/vendor/gelembjuk/php-easy-app/src/Gelembjuk/EasyApp/Controller.php(211): App\Controllers\Comments->getPhoto() #5 /home/vpohid/domains/vpohid.com.ua/app/Controllers/Base.php(97): Gelembjuk\EasyApp\Controller->action() #6 /home/vpohid/domains/vpohid.com.ua/src/vendor/gelembjuk/php-easy-app/src/Gelembjuk/EasyApp/Action.php(54): App\Controllers\Base->action() #7 /home/vpohid/domains/vpohid.com.ua/app/Action.php(25): Gelembjuk\EasyApp\Action->action() #8 /home/vpohid/domains/vpohid.com.ua/public/index.php(4): App\Action->action() #9 {main}