Turtlebot networking setup error

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Hello, I have a problem with networking setup. I followed this tut.

http://www.ros.org/wiki/Robots/TurtleBot/Network%20Setup

at the last step, on my workstation, I ran

rostopic pub -r10 /hello std_msgs/String "hello"

and when I ran

rostopic echo /hello

on my turtlebot laptop I got this:

WARNING: topic [/hello] does not appear to be published yet

according to the tut.

The message "hello" begin printed about 10 times a second.

but that is not happening.

Any suggestions will be appreciated.

Thanks!