ros2 config_error ai_generated true

[ERROR] [my_lifecycle_node]: Failed to configure: required parameter 'my_param' not set

ID: ros2/lifecycle-node-configure-failure-no-parameters

Also available as: JSON · Markdown · 中文
90%Fix Rate
86%Confidence
1Evidence
2023-04-01First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
ROS2 Foxy active — — —
ROS2 Galactic active — — —
ROS2 Humble active — — —
rclcpp 16.x active — — —

Root Cause

A lifecycle node's on_configure callback requires a parameter that is not provided in the node's parameter list, causing the transition to fail.

generic

中文

生命周期节点的 on_configure 回调需要一个未在节点参数列表中提供的参数，导致转换失败。

Official Documentation

https://docs.ros.org/en/humble/Tutorials/Intermediate/Lifecycle/Lifecycle.html

Workarounds

  1. 95% success Provide the missing parameter via a YAML file or command line: 'ros2 run my_package my_lifecycle_node --ros-args -p my_param:=value' 
    Provide the missing parameter via a YAML file or command line: 'ros2 run my_package my_lifecycle_node --ros-args -p my_param:=value'
  2. 85% success Modify the node's on_configure to use a default value if the parameter is not set: if (!this->get_parameter('my_param', my_param_)) { my_param_ = default_value; } 
    Modify the node's on_configure to use a default value if the parameter is not set: if (!this->get_parameter('my_param', my_param_)) { my_param_ = default_value; }

中文步骤

  1. 通过 YAML 文件或命令行提供缺失的参数：'ros2 run my_package my_lifecycle_node --ros-args -p my_param:=value'
  2. 修改节点的 on_configure 以在参数未设置时使用默认值：if (!this->get_parameter('my_param', my_param_)) { my_param_ = default_value; }

Dead Ends

Common approaches that don't work:

  1. 50% fail

    The parameter may still not be set if the user doesn't provide a value; the error occurs only if the parameter is explicitly required without a default.

  2. 90% fail

    Parameters must be declared before configure; reordering doesn't fix missing parameter values.

  3. 100% fail

    The lifecycle state machine prevents activation without successful configuration.