Error: Operation panel main page (Main.pns) is not found

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Problem

Pressing the [PANEL] button on the teach pendant shows the following message

Related error codes: 80800001

Solution

Make sure that you transfer your panel (.pns) files to the controller. These panel files will be listed with your other program files during a file transfer.

Also, your top-level panel screen must always be titled “main.pns” as shown below.  This is the panel screen that is accessed from the Teach Pendant F5 Function button.  From your main.pns panel screen, you can use the PAGECHANGE command to access other panel screens as you see fit. Other panel screens can be named with the same provisions as other programs. 

TP Panel Guide

https://www.fa-manuals.denso-wave.com/en/usermanuals/001852/