@jonasraoni The error persists. I disabled PKP-PL plugin on my test server and disabled scheduled tasks in cron/acron plugin on revistas.upr.edu. However, only one journal seems to be ok (https://revistas.upr.edu/index.php/forumempresarial). The plugin is not running to other journals on the same server (revistas.upr.edu). For example, this one: https://revistas.upr.edu/index.php/acceso
Any idea? Thanks in advance.