# RLException: \[main.launch\] is neither a launch file in package

**URL:** <https://get-help.theconstruct.ai/t/rlexception-main-launch-is-neither-a-launch-file-in-package/4717>\
**Category:** General Support\
**Created:** [August 5, 2020, 3:57am UTC](https://get-help.theconstruct.ai/t/rlexception-main-launch-is-neither-a-launch-file-in-package/4717 "2020-08-05T03:57:21Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![lneharde](https://get-help.theconstruct.ai/user_avatar/get-help.theconstruct.ai/lneharde/32/10_2.png) [@lneharde](https://get-help.theconstruct.ai/u/lneharde)\
**Post date:** [August 5, 2020, 3:57am UTC](https://get-help.theconstruct.ai/t/rlexception-main-launch-is-neither-a-launch-file-in-package/4717/1 "2020-08-05T03:57:21Z")

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I’m getting this error when running the following command  
“roslaunch duckietown\_gazebo main.launch”  
And the error is  
“RLException: [main.launch] is neither a launch file in package [duckietown\_gazebo] nor is  
[duckietown\_gazebo] a launch file name  
The traceback for the exception was written to the log file”

I try to run [live lecture #30](https://www.youtube.com/watch?time_continue=27&v=Cji2_DNbKQs&feature=emb_logo) locally,

I download the files I need, ran “catkin\_make” (it went fine), then “source devel/setup.bash” and then “rospack profile”. Then I try to run the launch file, which fails.

- I’m able to run “roslaunch fake\_navigation start.launch” but firstly, nothing happens (no simulation or anything). Secondly, this is not the file that was used in the live class.

- I downloaded the **fake\_navigation** folder (as is) from that live demo and placed it inside catkin\_ws. Also downloaded the simulation directory ( **simulation\_ws** ) and put it outside of catkin\_ws (they’re at the same level)

Any help to run it locally will be highly appreciated(!)

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<div class="post-metadata">

**Author:** ![duckfrost2](https://get-help.theconstruct.ai/user_avatar/get-help.theconstruct.ai/duckfrost2/32/9365_2.png) [@duckfrost2](https://get-help.theconstruct.ai/u/duckfrost2)\
**Post date:** [December 2, 2020, 8:44am UTC](https://get-help.theconstruct.ai/t/rlexception-main-launch-is-neither-a-launch-file-in-package/4717/2 "2020-12-02T08:44:54Z")

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Hi,

So most of our course simulations are public, you can find them in our git.  
Here is the one used in the course: [https://bitbucket.org/theconstructcore/riabot/src/master/](https://bitbucket.org/theconstructcore/riabot/src/master/)

Just download it and solve any dependecies you might have locally and launch:

```
roslaunch duckietown_gazebo city.launch

```

Hope it helped