That is an odd looking command. Go into your Studio > Dashboard > click the down arrow next to Host Tools and click Server Audit.. Scroll down until you see the Cron Jobs under Site Setup - You will see what your command should be. Mine looks like this (thats all one line btw):

/opt/plesk/php/7.1/bin/php -q /var/www/vhosts/mywebsite.com/httpdocs/periodic/cron.php

Maybe you have the wrong command in your Cron Job setup???