Hi,

Sadly, the OpenScreenInPopup system function cannot be called directly from the "Scheduled tasks", as*UI.*access is not supported in tasks, so you have to do a little extra step to do this.

You must set up a Scheduled task with "Trigger = Daily" (midnight in your case) to activate a tag. Then, you can place the tag on a screen (for example, on a Text box or I/O field that can be hidden) that is always visible in the HMI and use the process value change (Visibility > Change property) to call the script and, therefore, the popup to the Main Screen -> OpenScreenInPopup.

In this thread you can find several posts with further information on this:

Opening PopUp using ScheduledTasks