help with streaming

No matter what I try I just cannot seem to stream from my Imac to my Appletv. When I go to mount the volume I am getting this error.

Mount_smdfs(449)malloc *** Vm_allocate (size 3221221376)field (error code=3)

any idea?

You may have an error in your settings. If you want to post them here, or email them we can look them over.