Cron issue with shared hosting
I have resolved the issue. The path to the wordpress directory was wrong, don't know why. I have changed hosting during the week.

I had to add this line in civicrm.settings.php:

define('CIVICRM_CMSDIR','/var/www/vhosts/website.org/httpdocs');


This issue helped me: Problem with open_basedir restriction in effect