You have set a PHP minimum of "0" bytes in your domain - specific PHP - settings, or in the depending subscription plan settings, or in your service plan settings, or at your global "php.ini", located at "%plesk_dir%\Additional\PleskPHP5\php.ini"
Please see and follow the Plesk documentation ( and its links! ) and raise your current settings for "memory_limit" :
Please see as well the PHP documentation at : http://php.net/manual/es/ini.core.php( spanish link, please change ""/es/" within this link to your country - code, if you desire another language )