open_ptrack_v2: Intrinsic Calibration Problem

I am trying to perform an intrinsic calibration with a Kinect v2but when I type the command

sudo ./kinect2_bridge

an error occurs:

[FATAL] ROS_MASTER_URI is not defined in the environment. Either type the following or (preferrably) add this to your ~/.bashrc file in order set up your local machine as a ROS master:

export ROS_MASTER_URI=http://localhost:11311

then, type ‘roscore’ in another shell to actually launch the master program.

After doing what it says the error still occurs. Since in the instructions for intrinsic calibration it is written to ignore the error I proceed with the calibration and, after creating a temporary folder, I type

roslaunch kinect2_bridge kinect2_bridge.launch

but another error occur:

arg ‘publish_frame’ is not defined.

Arg xml is <arg name="publish_frame" value="$(arg publish_frame)"/> The traceback for the exception was written to the log file

I tried to solve it by looking at similar issues from other people but I still don’t know how to solve this problem.