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Launch file error

asked 2020-01-06 06:24:57 -0500

Kora11101 gravatar image

updated 2020-01-06 07:04:36 -0500

Delb gravatar image

After entering a command "projectbot_world.launch, I see problems like:

Invalid <arg> tag: projectbot_gazebo
ROS path [0]=/opt/ros/kinetic/share/ros
ROS path [1]=/opt/ros/kinetic/share. 

Arg xml is <arg name="world_name" value="$(find projectbot_gazebo)/worlds/"/>
The traceback for the exception was written to the log file

Do you have an idea how to solve it?

Thanks a lot :)

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answered 2020-01-06 07:19:00 -0500

Delb gravatar image

The problem here is that you haven't sourced your workspace so the package projectbot_gazebo isn't found. The two ROS path lines that you get from the error are all the data within the variable ROS_PACKAGE_PATH, when using $(find PKG) you will search if a package can be found at the different pathes of the variable. Sourcing your catkin workspace add the path of the packages of your workspace to this variable.

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I'm not sure this is the case. We'd typically see a "ResourceNotFound" error in that case.

The OP here posts a "Invalid <arg> tag".

gvdhoorn gravatar image gvdhoorn  ( 2020-01-06 07:32:07 -0500 )edit

I've tried different errors by trying to find something that doesn't exist :

  • Within an arg tag as OP's error and it returned the same error.
  • Within a node tag the output error is the different pathes of ROS_PACKAGE_PATH
  • Within an include tag indeed I got the error ResourceNotFound

I would guess that when using the include tag an error is raised before the error when parsing the xml file.

Delb gravatar image Delb  ( 2020-01-06 08:17:05 -0500 )edit

Interesting. Thanks for checking.

gvdhoorn gravatar image gvdhoorn  ( 2020-01-06 08:44:53 -0500 )edit

So what Exactly should I do? I don't understand the sollution :(

Kora11101 gravatar image Kora11101  ( 2020-01-10 08:54:01 -0500 )edit

You have to source your workspace.

Delb gravatar image Delb  ( 2020-01-10 09:09:46 -0500 )edit

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Asked: 2020-01-06 06:24:57 -0500

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Last updated: Jan 06