Can't delete item forest on my map

hi
i find the problem on my map but i can't delete the object problem.
Someone have an idea ?
The object doesn't appear in Forest item data

 

@LJFHutch You got any ideas what this Unidentified Object is?

 

it's chopped one for sure i check all of them always the same thing no forest item data for all
I share this map with my brother and he have this error

Failed to create resource (is the file missing?):
Levels/Deathland/art/shapes/trees/trees_beech/tree_beech_choped_b.dae
levels/Deathland/art/shapes/trees/trees_beech/tree_beech_c
levels/Deathland/art/shapes/trees/trees_aspen/tree_aspen_chopped.d

 

i find what happen =)