You can't place widgets on a layer different than the UIPanel that manages them.

[shokinhan]

What's the means ?

If a gameobject has a panel, the gameobject's children can't has new panel?

If a gameobject has a panel, another gameobject can't be added to the panel?

Thanks!!!!!

[ArenMook]

It means the game object that has UIPanel is on a different layer than the game object of one or more widgets underneath that panel. UIPanel expects the entire hierarchy to have the same layer.