models/props_foliage/tree_slice01.mdl cannot be spawned

prop_physics 'models/props_foliage/tree_slice01.mdl' has a base specified as 'Wooden_Unbreakable.Huge', but there is no matching entry in propdata.txt.
prop_physics at -63 286 -148 uses model models/props_foliage/tree_slice01.mdl, which has an invalid prop_data type. DELETED.
sandbox\gamemode\commands.lua:116: Tried to use invalid object (type IPhysicsObject) (Object was NULL or not of the right type)

In the spawnlist ‘HL2: Episode 2’. Help please, I wish to use this in my gamemode.

Delete propdata.txt?