ros2 launch_error ai_generated true

launch.invalid_launch_file_error.InvalidLaunchFileError: Caught exception when trying to load file

ID: ros2/launch-file-error

Also available as: JSON · Markdown
92%Fix Rate
90%Confidence
3Evidence
2023-01-01First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
2 active — — —

Root Cause

ROS 2 launch file has a Python syntax error or incorrect launch API usage.

generic

Workarounds

  1. 90% success Use ros2 launch --print to validate syntax without executing 
    ros2 launch my_package my_launch.py --print
  2. 92% success Follow Python launch template with LaunchDescription and Node action 
    from launch import LaunchDescription; from launch_ros.actions import Node
  3. 88% success Read the full traceback - the actual Python error is at the bottom

Dead Ends

Common approaches that don't work:

  1. Convert ROS 1 XML launch directly to ROS 2 XML without API changes 80% fail

    ROS 2 XML launch uses different tags and attribute names than ROS 1

  2. Use print() for debugging inside launch descriptions 65% fail

    Launch descriptions are declarative; print() runs at parse time not launch time