MenuItem errors on import

[btrikojus]

Hi there,

just bought NGUI from Asset store and tried to import it into Unity 4.5.4.  Got these errors:

Assets/NGUI/Examples/Scripts/InventorySystem/Editor/InvFindItem.cs(28,10): error CS0616: `MenuItem': is not an attribute class
Assets/NGUI/Examples/Scripts/InventorySystem/Editor/InvFindItem.cs(28,10): error CS0246: The type or namespace name `MenuItemAttribute' could not be found. Are you missing a using directive or an assembly reference?

Tried deleting that script and a bunch of new (similar) errors appeared.  Tried redownloading and reimporting plugin.  Tried reimporting all assets.

Thanks

[btrikojus]

Just noticed that error doesn't occur if I import the plugin into a blank project.  Any idea where to find the conflict?

Thanks

[btrikojus]

never mind.  Had a custom object called MenuItem.

Thanks