I had this exact same issue (just found this thread via Google) and was able to resolve it by installing the python3 branch of the "kcjengr/qtpyvcp.conversational-gcode" repository.
Instead of this command from the documentation:
Code:
pip install git+https://github.com/kcjengr/qtpyvcp.conversational-gcode.git
I did the following:
Code:
git clone https://github.com/kcjengr/qtpyvcp.conversational-gcode
cd qtpyvcp.conversational-gcode
git checkout python3
pip install .
An then I was able to start probe_basic.
