Hi Qingru,
I would guess that the multi-cast route is missing, which is required for the Galil driver you're using.
We add the following line into /etc/rc.local
route add -net 224.0.0.0 netmask 240.0.0.0 dev eth0
The error simply says it could not poll the first 8 digital inputs with Galil TI (Tell input) command.
Also there is a newer Galil driver designed to replace the one your using located here:
http://motorapp.github.io/Galil-3-0/
Best wishes,
Mark
Dr. Mark Clift
Senior Controls Engineer
Australian Synchrotron
800 Blackburn Road
Clayton 3168
Ph: +613 8540 4264
Fax: +613 8540 4200