I tried the Slam tutorials and I am getting this error.
process[rplidar-1]: started with pid 
ERROR: cannot launch node of type [tutorial_pkg/drive_controller_node]: can’t locate node [drive_controller_node] in package [tutorial_pkg]
The code still works but the output map is not legit
Did you create and build work space with this node before using launch file?
If you didn’t do that check previous tutorials:
If you will have further question, let me know.
Thanks Hubert yes I was trying out the tutorials and there was mistake on cmakelist.txt file. Its working fine now.