Terrain tree bug thing??

I imported a tree I made in blender, then I make a prefab with a capsule collider and I remove the animator. Then I add the tree to the terrain tree add thingy in the terrain options. But the trees don’t seem to show or place?

Try this
http://answers.unity3d.com/questions/519300/what-kind-of-models-are-acceptable-for-the-tree-pa.html