how use rosrun walk_msgs generator _yaml:=/sample/short_walk.yaml? [closed]

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Hello Everyone!!

I have an error when use:

rosrun walk_msgs generator _yaml:=/sample/short_walk.yaml

fatal error: bad type for pattern generator node (expected type: map, parsed type: null) [ERROR] [1369543267.813844427]: fatal error: bad type for pattern generator node (expected type: map, parsed type: null)

http://www.ros.org/wiki/walk_msgs/Tutorials/Loading%20a%20precomputed%20trajectory

I think that is because don't know where must be location of short_walk.yaml

Who would help me?

Thanks a lot, Vincent