Launch file unable to launch node


I have gotten the same error every time I use roslaunch for all of the quizzes on ROS in 5 days with Python. My launch files are correct. I was wondering what else I could possibly try fixing?

RLException: Unable to launch [service_move_bb8_in_square_custom_server-1].
If it is a script, you may be missing a ‘#!’ declaration at the top.
The traceback for the exception was written to the log file

Hi @lfalk2 ,

Welcome to the Community!

This is a simple problem (I guess). You must include the interpreter identification line with shebang (#!) in python scripts. Just include this line on the very top of your python programs:

#! /usr/bin/env python 

import rospy
# Other imports

# Program Code

# End of Code

Do not forget to do chmod 755 <python_file_name>.py so that the file becomes executable!

Let me know if your problem is resolved after doing these steps.


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