Call to undefined function event_manager_template_help_text

• install and enable event_manager_reminder
• goto http://mysite/admin/settings/event_manager/reminder
• you'll have a white page
• open your console
• tail -F /path/to/apache-logs/mysite-error.log
• i find there: PHP Fatal error: Call to undefined function event_manager_template_help_text() in /home/apache2/vhosts/mysite/sites/all/modules/event_manager_reminder/event_manager_reminder.module on line 62

I've solved this adding a dummy :

function event_manager_template_help_text() {
  return;
}

inside my custom module

hope this helps