Cannot load dependencies of stack [segway_rmp]: segway_rmp

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Hi, I just followed the instructions in ROS wiki website http://www.ros.org/wiki/segway_rmp to install segway_rmp in my computer.

But it came with the following problem:

Stack: segway_rmp Cannot load dependencies of stack [segway_rmp]: segway_rmp ROS path [0]=/opt/ros/fuerte/share/ros ROS path [1]=/home/lilimeng/fuerte_workspace/turtlebot ROS path [2]=/home/lilimeng/fuerte_workspace/sandbox ROS path [3]=/opt/ros/fuerte/stacks ROS path [4]=/opt/ros/fuerte/share ROS path [5]=/opt/ros/fuerte/share/ros ROS path [6]=/home/lilimeng/ros_workspace

So what's the problem? Your help is highly appreciated