duckjun,
Sorry that you are seeing this issue.
From the stacktrace, it looks like a Python debugger related problem.
Another user reports similar error here : https://stackoverflow.com/questions/53198901/pydev-debugger-not-working-but-can-run-code-fine
I suggest you also cross post to development related forums like stackoverflow.com or Python related forums for better suggestions from the developer community.
Hope this helps. Please let us know if you have any further questions.
–Swapna
Genuitec Support