dora python example error

[RuPingCen]

Describe the bug
We hope to display Dora node data by using ROS2 nodes, so we are trying Python-ROS2-dataflow. When we use

ros2 run turtlesim turtlesim_node 

to launch turtlesim node, and another terminator input the command as follow:

dora up
dora start dataflow.yml --name test

The screen shows the turtle, but the dora node reports an error：

The dataflow.yml file

nodes:
  - id: turtle
    custom:
      source: ./random_turtle.py
      inputs:
        direction: control/direction
      outputs:
        - turtle_pose

  - id: control
    custom:
      source: ./control_node.py
      inputs:
        turtle_pose: turtle/turtle_pose
        tick: dora/timer/millis/500
      outputs:
        - direction

Can you give me some ideas on how to solve this error？

[haixuanTao]

Have you installed dora Python with:

pip install dora-rs

You can check the documentation at https://dora.carsmos.ai/docs/guides/Installation/installing