problems subscribing to turtlebot_node/sensor_state

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Hello,

I am trying to subscribe to turtlebot_node/sensor_state so that I can tell when my Turtlebot has bumped into something and handle it accordingly. Whenever I try to run it, however, it gives me the error message:

 File "/opt/ros/electric/stacks/turtlebot_apps/turtlebot_teleop 
 /bin/turtlebot_teleop_key", line 35, in <module>
     from turtlebot_node.msg import TurtlebotSensorState
 ImportError: No module named turtlebot_node.msg

My import statements are as follows:

from os import system
import curses
import roslib; roslib.load_manifest('turtlebot_teleop')
import rospy
import random
from turtlebot_node.msg import TurtlebotSensorState
from geometry_msgs.msg import Twist

From other examples I can find online, it seems like this should work. turtlebot_node is definitely running correctly and I have no trouble getting it to move without implementing a bump correction algorithm. What do you think is wrong?

Thanks, Matthew