cannot locate node joy [closed]

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Using Hydro on Precise. Following the tutorials on joystick operation here and here. The joystick works, roscore is running, joy_node is running, when I do rostopic echo joy I see the vectors change as I expect when the joystick controls are moved. When I run roslaunch learning_joy turtle_joy.launch however, the joystick still works, topic echo shows still sending, but no movement of the turtle. The error message is as follows:

roslaunch learning_joy turtle_joy.launch
... logging to /home/richard/.ros/log/3b2f6bb6-e9cc-11e3-811a-00215c98e435/roslaunch-inga-12328.log
Checking log directory for disk usage. This may take awhile.
Press Ctrl-C to interrupt
Done checking log file disk usage. Usage is <1GB.

started roslaunch server http://inga:38218/

SUMMARY
========

PARAMETERS
 * /axis_angular
 * /axis_linear
 * /rosdistro
 * /rosversion
 * /scale_angular
 * /scale_linear
 * /turtle_joy/deadzone
 * /turtle_joy/dev

NODES
  /
    sim (turtlesim/turtlesim_node)
    teleop (turtle_teleop/turtle_teleop_joy)
    turtle_joy (joy/joy)

ROS_MASTER_URI=http://localhost:11311

core service [/rosout] found
process[sim-1]: started with pid [12346]
ERROR: cannot launch node of type [joy/joy]: can't locate node [joy] in package [joy]
ERROR: cannot launch node of type [turtle_teleop/turtle_teleop_joy]: turtle_teleop
ROS path [0]=/opt/ros/hydro/share/ros
ROS path [1]=/home/richard/catkin_ws/my_src
ROS path [2]=/home/richard/catkin_ws/src
ROS path [3]=/opt/ros/hydro/share
ROS path [4]=/opt/ros/hydro/stacks

A search of ROS answers (unless I missed something) yields nothing that I haven't already tried. Any ideas?