Where is the error? I couldn’t figure it out.

user:~/catkin_ws/src/my_project/src$ chmod +x wall_following.py
user:~/catkin_ws/src/my_project/src$ cd
user:~$ cd ~/ catkin_ws
bash: cd: too many arguments
user:~$ cd ~/catkin_ws
user:~/catkin_ws$ roslaunch my_project my_project.launch
… logging to /home/user/.ros/log/4891de4a-d52a-11ec-8455-0242ac120007/roslaunch-1_xterm-6324.log
Checking log directory for disk usage. This may take a while.
Press Ctrl-C to interrupt
Done checking log file disk usage. Usage is <1GB.

RLException: Invalid roslaunch XML syntax: mismatched tag: line 5, column 2
The traceback for the exception was written to the log file

It means that in the second column of the fifth line of your launch file, there is invalid syntax, i.e. you misspelled, added an invalid character or removed a necessary one.

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