Error on the robot: Unable to launch posenet-2

[bach05]

Hi,

I'm using the TIAGo robot from PAL Robotics. I have deployed your ROS package in the robot with the official script. Then I have launched npm install. When I tried to launch with roslaunch ros_posenet posenet.launch I got this error:

process[republisher-1]: started with pid [16744]
RLException: Unable to launch [posenet-2].
If it is a script, you may missing a '#!' declaration at the top. 
The traceback for the exception was written to the log file
[posenet-2] killing on exit
[republisher-1] killing on exit

Do you know why this is happening? I'm running on ROS Melodic.