Sprite Manager Two.. Packed Sprite doesnt compile.

I just got Sprite Manager Two from the asset store, and dragged a packed sprite onto my empty game object, and it doesnt compile says:

Assets/Scripts/Sprite Scripts/Support/SpriteBase.cs(1290,30): error CS0506: SpriteBase.Delete()': cannot override inherited member SpriteRoot.Delete()’ because it is not marked virtual, abstract or override

anyone else get this?

dunno what happened… i reimported it and it works now…