{
  "id": "ros2/turtlebot3-gazebo-no-robot-spawned",
  "signature": "[ERROR] [turtlebot3_gazebo]: No robot spawned. Check TURTLEBOT3_MODEL environment variable.",
  "signature_zh": "[错误] [turtlebot3_gazebo]: 未生成机器人。请检查 TURTLEBOT3_MODEL 环境变量。",
  "regex": "\\[ERROR\\] \\[turtlebot3_gazebo\\]: No robot spawned\\. Check TURTLEBOT3_MODEL environment variable\\.",
  "domain": "ros2",
  "category": "config_error",
  "subcategory": null,
  "root_cause": "The TURTLEBOT3_MODEL environment variable is not set or set to an invalid model name (e.g., 'burger', 'waffle', 'waffle_pi') before launching Gazebo simulation.",
  "root_cause_type": "generic",
  "root_cause_zh": "在启动 Gazebo 仿真之前，TURTLEBOT3_MODEL 环境变量未设置或设置为无效的模型名称（例如 'burger'、'waffle'、'waffle_pi'）。",
  "versions": [
    {
      "version": "ROS2 Humble (Ubuntu 22.04)",
      "introduced": null,
      "deprecated": null,
      "removed": null,
      "behavior_change": null,
      "status": "active"
    },
    {
      "version": "ROS2 Iron (Ubuntu 22.04)",
      "introduced": null,
      "deprecated": null,
      "removed": null,
      "behavior_change": null,
      "status": "active"
    },
    {
      "version": "turtlebot3 2.2.x",
      "introduced": null,
      "deprecated": null,
      "removed": null,
      "behavior_change": null,
      "status": "active"
    },
    {
      "version": "Gazebo 11.x",
      "introduced": null,
      "deprecated": null,
      "removed": null,
      "behavior_change": null,
      "status": "active"
    }
  ],
  "os_specific": {},
  "dead_ends": [
    {
      "action": "",
      "why_fails": "The launch file reads TURTLEBOT3_MODEL at startup; without it, no robot URDF is loaded.",
      "fail_rate": 0.95,
      "condition": "",
      "sources": []
    },
    {
      "action": "",
      "why_fails": "Only 'burger', 'waffle', 'waffle_pi' are valid; typos or unsupported models cause spawn failure.",
      "fail_rate": 0.9,
      "condition": "",
      "sources": []
    },
    {
      "action": "",
      "why_fails": "The environment variable must be set in the same shell session before launch, not sourced from a different workspace.",
      "fail_rate": 0.8,
      "condition": "",
      "sources": []
    }
  ],
  "workarounds": [
    {
      "action": "export TURTLEBOT3_MODEL=burger",
      "success_rate": 0.9,
      "how": "export TURTLEBOT3_MODEL=burger",
      "condition": "",
      "sources": []
    },
    {
      "action": "Add export to .bashrc: echo 'export TURTLEBOT3_MODEL=burger' >> ~/.bashrc && source ~/.bashrc",
      "success_rate": 0.95,
      "how": "Add export to .bashrc: echo 'export TURTLEBOT3_MODEL=burger' >> ~/.bashrc && source ~/.bashrc",
      "condition": "",
      "sources": []
    }
  ],
  "workarounds_zh": [
    "export TURTLEBOT3_MODEL=burger",
    "将导出命令添加到 .bashrc：echo 'export TURTLEBOT3_MODEL=burger' >> ~/.bashrc && source ~/.bashrc"
  ],
  "transition_graph": {
    "leads_to": [],
    "preceded_by": [],
    "frequently_confused_with": []
  },
  "official_doc_url": "https://emanual.robotis.com/docs/en/platform/turtlebot3/quick-start/",
  "official_doc_section": null,
  "error_code": null,
  "verification_tier": "ai_generated",
  "confidence": 0.88,
  "fix_success_rate": 0.85,
  "resolvable": "true",
  "first_seen": "2023-06-15",
  "last_confirmed": "2024-06-01",
  "last_updated": "2024-06-01",
  "evidence_count": 1,
  "tags": [],
  "locale": "en",
  "aliases": []
}