Hey there,
I think we have a small mistake here,
the exercise says: a)
In the package that you created in Exercise 3.3, create a new launch file named my_amcl_launch.launch . Copy the contents of the amcl_demo.launch file to this file.
to find the parameters which should be changes we should copy the content of amcl.launch an not amcl_demo.launch
This would be straight forward with the describtion
greetings
Still seems to be the way noted by @lwidowski - still says amcl_demo.launch
I came to a similar conclusion that he did, which is why I came to look at the support forum. But just copying amcl_demo.launch will work either - that doesn’t launch a map server. Not sure how important launching move_base is (which is the other thing launched in the amcl_demo.launch file).
Here’s what I did:
In the my_amcl_launcher package I made 2 new launch files: my_amcl_demo.launch and my_amcl_launch.launch
I copied the contents of amcl_demo.launch into the my_amcl_demo.launch file. In that file I changed the Run AMCL part as follows:
<include file="$(find my_amcl_launcher)/launch/my_amcl_launch.launch" />
I copied the contents of amcl.launch into the new my_amcl_launch.launch file. I then changed the parameters as indicated in the exercise.
I launched as you’d expect: roslaunch my_amcl_launcher my_amcl_demo.launch
I got the expected result as shown in RVIZ, so it all worked.
Hope that helps.
/K
Hi @albertoezquerro
Just wanted to inform that this typo still exists in case you’d like to rectify 
Thanks!