undefined symbol: ORBit_skel_class_register

Hi,
 
I install orbit2 on a linux machine , and try to play around the echo example from the ORBit Beginners Documentation v1.6. (http://www.gnome.org/projects/ORBit2/documentation.html)
 
The compilation is fine, but when I run the echo-server according to the instruction, it gives error like:

./echo-server: relocation error: ./echo-server: undefined symbol: ORBit_skel_class_register
 
 
I am new to orbit2, and don't know where to look for help. Can anyone provide some help ?
 
Thanks a lot!
 
Michael