I'm trying to update the latest Cyclops unlocked gpi file to my dnx521dab but it is giving an error

It recognises theres garmin\poi\poi.gpi and asks to update "New custom POIs detected...." on the nav screen, when I press Yes it says: "Cannot copy the custom POIs"

I've tried to delete the custom POIS in Tools not sure if it successfully does it any way of knowing? or any help to fix this please.