| Prior to the Pre-Display event point(s), Appx copies designed widgets (that is, widgets that you painted in the image editor, as opposed to widgets that you create at runtime through ILF code) out of the EM and into the --- WIDGET file. After the Pre-Display event point(s), Appx takes a snapshot of the items in the --- WIDGET file and pushes them out to the screen (or to the report if you're running an output process).
This error occurs when Appx takes the snapshot (after you've had a chance to change the widgets with ILF code).
The primary key to the internal widget file is position row+position col. There's an alternate unique key that on name + appearance number. Check for duplicate name+appearance number.
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FAQ's - APPX Software, Inc. : 
Message; “Application Lock verification failed. Access Denied”.