Connecting to homemade reach

I having problem using ROS 2 humble or the Python SDK to connect.

I 3D printed a homemade reachy arm and I am using the dynamixel motors recommended. I am also using a U2D2 power board and a desktop computer. My arm is attached to the computer via USB. I downloaded ROS 2 humble.

When I tried to launch the bring up file, i get the following error: no module named ‘pypot’ reachy_discovery finished
Please I desperately need some help. Thank you