The leapmotion/data topic is throwing an error

[stevensu1838]

The leapmotion/data topic is throwing an error ERROR: Cannot load message class for [leap_motion/leapros]. Are your messages built?

Hi sir, I've tried to reinstall leapmotion and it ROS driver. But I still recieve the same error. Can you please kindly take a look at the following scrits that I used? Much appreciated. Thank you so much for you constant support.

ROS indigo in Ubuntu 14.04 machine
1.Install Leapmotion
V2 Tracking Downloads
https://developer.leapmotion.com/sdk/v2

I install it in the directory of LeapDeveloperKit_2.3.1+31549_linux, which is /home/ysu66/Downloads/LeapDeveloperKit_2.3.1+31549_linux.

After installation, I get the following info in the terminal. 

Check Leap Motion daemon with:
  service leapd status
Open the Leap Motion GUI with:
  LeapControlPanel

2.Install leapmotion driver(I follow this site http://wiki.ros.org/leap_motion)

ysu66@mech1331:~$ cd ~/catkin_ws/src
ysu66@mech1331:~$ git clone https://github.com/qqfly/leap_motion.git
ysu66@mech1331:~$ cd ~/catkin_ws && catkin_make


3.Start the Leap Motion driver
ysu66@mech1331:~$ leapd
[Critical] Unhandled exception: boost::filesystem::status: Permission denied: "/var//.Leap Motion/config.json"
[Critical] Secure WebSocket server failed to start
[Critical] WebSocket server failed to start
[Critical] Have you tried running as root/Administrator?
ysu66@mech1331:~$ 

Then I run the follwoing

ysu66@mech1331:~$ sudo leapd
[sudo] password for ysu66: 
[Critical] Secure WebSocket server failed to start
[Critical] Have you tried running as root/Administrator?
[Critical] WebSocket server failed to start
[Info] Leap Motion Controller detected: LP59556685952
[Info] Firmware is up to date.

It is not seting up properly,  I run sudo service leapd stop and sudo leapd. Then it works well.

ysu66@mech1331:~$ sudo service leapd stop
leapd stop/waiting
ysu66@mech1331:~$ sudo leapd
[Info] WebSocket server started
[Info] Secure WebSocket server started
[Info] Leap Motion Controller detected: LP59556685952
[Info] Firmware is up to date.


3.sudo LeapControlPanel (I can visualize my hands in the GUI)

4.Configure PYTHONPATH 
ysu66@mech1331:~$ echo "export PYTHONPATH=$PYTHONPATH:$HOME/LeapSDK/lib:$HOME/LeapSDK/lib/x64" >> ~/.bashrc
ysu66@mech1331:~$ source ~/.bashrc
ysu66@mech1331:~$ gedit ~/.bashrc

The following is what it shows in the end of ~/.bashrc
source /opt/ros/indigo/setup.bash
source ~/catkin_ws/devel/setup.bash
export PYTHONPATH=/opt/ros/indigo/lib/python2.7/dist-packages:/home/ysu66/LeapSDK/lib:/home/ysu66/LeapSDK/lib/x64:/home/ysu66/LeapSDK/lib:/home/ysu66/LeapSDK/lib/x64:/home/ysu66/LeapSDK/lib:/home/ysu66/LeapSDK/lib/x64


4.rostopic echo /leapmotion/data (It throws errors)

After that, I firstly run 
ysu66@mech1331:~$ source ~/catkin_ws/devel/setup.bash && roslaunch leap_motion sensor_sender.launch(another terminal)
But when run rostopic echo /leapmotion/data, I get the following error:

ysu66@mech1331:~$ rostopic echo /leapmotion/data(another terminal)
ERROR: Cannot load message class for [leap_motion/leapros]. Are your messages built?
ysu66@mech1331:~$ 

Also, I secondly run ysu66@mech1331:~$ source ~/catkin_ws/devel/setup.bash && rosrun leap_motion sender.py after I stop last command by CTRL+C.

ysu66@mech1331:~$ source ~/catkin_ws/devel/setup.bash && rosrun leap_motion sender.py(another terminal) 
ysu66@mech1331:~$ rostopic echo /leapmotion/data(another terminal)
ERROR: Cannot load message class for [leap_motion/leapros]. Are your messages built?
ysu66@mech1331:~$