# rtabmap: the launch file stereo_mapping.launch not work?

hi all, I am new to ros and rtabmap. I am trying to run the example of rtabmap tutorials (Stereo mapping,Process a directory of stereo images in ROS, stereo_20Hz.zip).

But the stereo_20Hz.launch file can not run and error is:

    ... logging to /home/zahra/.ros/log/709c28dc-a145-11e7-8f93-c8600022c399/roslaunch-zahra-9839.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.

unused args [rgbd] for include of [/opt/ros/indigo/share/rtabmap_ros/launch/rtabmap.launch]
The traceback for the exception was written to the log file


unused args [rgbd] for include of means that there's an unused arg in a launch file. I don't see a stereo_20Hz.launch file in the GitHub repo so unless you post the launch file or a link to its repository I can't help much beyond that. Also, is that the entire error?