When resetting oH I always get the error message below concerning the group “Gtest”
openhab Cannot add "GroupItem" with key "Gtest". It exists already from provider "GenericItemProvider"! Failed to add a second with the same UID from provider "GenericItemProvider"!
Could someone please explain the meaning and maybe how to solve.
By way of explanation, it is trying to add an Item named Gtest when one already exists. Maybe you have both PaperUI and xxx.items file definitions, or in more than onexxx.items file, etc.