This must be FORM ERROR

FRM-41810: Error creating menu.

Cause: You tried to use the menu component from within Form Builder, and an internal error occurred.

Action: Contact your DBA.

Level: >25

Type: Error

Try to recompile your MMB file and attach it to Form ..it will work ,
If it does not work Change the MMB file name and location then recompile it .

This may help to sort out your Problem.