I have a custom module for a cron job in Drupal 7 Elysia Cron. I have the same issue as stated in https://drupal.stackexchange.com/questions/249377/cron-job-in-custom-module-not-appearing-in-cron-settings-using-elysia-cron?rq=1. However, there are no solutions in there. My custom module seems to be available in development server but not in production server although the code is exactly the same.