Eye aim constrain with rigged mesh

[Anonymous]

Capture.PNG

i have this mesh with rigged body and an issue with eyes with aim constrains

when i make parent constrain with eyes controllers it work and when i try to make aim constraint with eyes it give me this issue as photo 

please help me and fix that

http://www.mediafire.com/file/si0dmlkb307poeu/zombie.rar/file

[Anonymous]

Hey there!

Not 100% sure if you know, but this model has already been rigged by Sony Imageworks?

Zombie Rig

Just in case you randomly just found the model itself... as far as your problem goes, I would have to take a look at the file because I feel its mainly a hierarchy issue of where you have the geometry of the eyes, the joints and the controllers. 

Can you place your file here perhaps?