F5 Link controller -no reply from big3d: timed out

hi ,

I have a link controller and i want to use it to load balance traffic for outbound connection , but every time when i add the link it status is down and i got this message "Offline (Enabled) - Monitor /Common/bigip_link from <unknown> : no reply from big3d: timed out"

Do any body know what is the root cause for this issue?