Unable to Launch ROS Package Exercise 3.1

[asghar.arafat]

I am getting the following error:

RLException: Invalid roslaunch XML syntax: mismatched tag: line 3, column 2
The traceback for the exception was written to the log file

[albertoezquerro]

Hello @asghar.arafat ,

This looks like you have a syntax error in your launch file. Can you copy the file contents here?

[asghar.arafat]

Dear @albertoezquerro. Thank you for your response.

My launch file is given as under:

The python file simple_topic_publisher.py is given as follows:

#! /usr/bin/env python

import rospy

from geometry_msgs.msg import Twist

rospy.init_node(‘move_robot_node’)

pub = rospy.Publisher(‘/cmd_vel’, Twist, queue_size=1)

rate = rospy.Rate(2)

move = Twist()

move.linear.x = 0.5

move.linear.z = 0.5

while not rospy.is_shutdown():

pub.publish(move)

rate.sleep()

[albertoezquerro]

Hello @asghar.arafat ,

I don’t see any launch file in your response, only the Python code.

[asghar.arafat]

Dear @albertoezquerro,

My apologies for this. For some unknown reason, the launch file text simply does not appear in the post despite typing. So I am going to attach a screenshot instead.

[albertoezquerro]

Hello @asghar.arafat ,

I just tested your launch file and it worked OK for me, so I understand you were able to solve this issue.