"file is directory" occured when load an asset bundle on iOS

I build and asset bundle contain fbx with animation clip.

I can load it with WWW and add the animation clip to my animation manager script when run in unity editor;

but failed after I build to iOS.:frowning:

WWW.error = “file is directory”

Any idea ?

did you figure this out?
I am getting the same error on iOS trying to load a texture.