Failed to apply efforts to joints in gazebo on ros fuerte

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Hi all,

I follow this tutorial using Fuerte, but the link does not rotate after

$rosservice call gazebo/apply_joint_effort '{joint_name: link_joint, effort: 0.01, start_time: 10000000000, duration: 1000000000}'

instead I get

ERROR: transport error completing service call: unable to receive data from sender, check sender's logs for details

I have launched

$ roslaunch gazebo_worlds empty_world.launch

on ROS Fuerte, Ubuntu 11.10 64-bit.

Where could I see sender's logs as suggested by the error msgs above?

Is there another way (how) to apply effort to joints in gazebo in Fuerte?

I note that the tutorial I follow was written for C-Turtle.