Question Running ros2 topic echo "topic" throws ModuleNotFoundError: No module named 'unity_robotics_demo_msg

Hi all, i have a problem.

I have connected ROS2 FOXY and UNITY, and i am trying to run RosPublisherExample, but when i open /pos_rot topic, i get an error (see the screenshot please).

I followed these tutorials and Unity documentations:
ROS2 installation -

Unity Setup (the two tutorial below, but in a video) -

ROS-Unity Demo Setup - https://github.com/Unity-Technologi...main/tutorials/ros_unity_integration/setup.md
ROS-Unity Integration: Publisher - https://github.com/Unity-Technologi.../tutorials/ros_unity_integration/publisher.md

My OS: Windows 10, but i am running ROS2 and have my Colcon Workspace in WSL2 and with Windows Terminal
Unity Version: 2020.3.30f1
Ubuntu version in WSL2: 20.04.5 LTS
ROS2: FOXY
ROS2 Domain ID: 0
Also, i am NOT using Docker

I tried creating Ubuntu-20.04 virtual machine in VirtualBox, but i get the same error.

Does somebody know what causes this and/or how to fix it?
Thank you.