Issue with ms-python debug adapter - constructor args mismatch

While debugging with ms-python extension it produces this error.

The error is happening on even older code-server versions including 3.2.0 even if you downgrade the ms-python extension all the way down to 2020.3.69010

Also tried with a different node version 14.x but no difference.

Seems ms-python debugpy implementation has had some kind of server side update which is why it’s affecting even older versions of code-server including the older version of ms-python extension.

The debugpy which implements debug adapter protocol when invoked from code-server ui fails as the class could not be instantiated due to mismatch in constructor arguments.

This commit might be responsible for this issue : https://github.com/microsoft/vscode-python/commit/650e4a93aa9c855113cfc4ea94033678a53eb6ab

This was working fine until 2 days ago. A similar jira has been filed here : https://github.com/microsoft/vscode-python/issues/12465

Stack trace : Debugger Error: The number of constructor arguments in the derived class s must be >= than the number of constructor arguments of its base class. Error Error: The number of constructor arguments in the derived class s must be >= than the number of constructor arguments of its base class. at /home/$user/.local/share/code-server/extensions/ms-python.python-2020.5.86806/out/client/debugger/debugAdapter/main.js:16:49631 at Array.forEach (<anonymous>) at e (/home/$user/.local/share/code-server/extensions/ms-python.python-2020.5.86806/out/client/debugger/debugAdapter/main.js:16:49194) at Object.t.plan (/home/$user/.local/share/code-server/extensions/ms-python.python-2020.5.86806/out/client/debugger/debugAdapter/main.js:16:49709) at /home/$user/.local/share/code-server/extensions/ms-python.python-2020.5.86806/out/client/debugger/debugAdapter/main.js:16:46365 at e._get (/home/$user/.local/share/code-server/extensions/ms-python.python-2020.5.86806/out/client/debugger/debugAdapter/main.js:16:46274) at e.get (/home/$user/.local/share/code-server/extensions/ms-python.python-2020.5.86806/out/client/debugger/debugAdapter/main.js:16:44985) at a.get (/home/$user/.local/share/code-server/extensions/ms-python.python-2020.5.86806/out/client/debugger/debugAdapter/main.js:16:169492) at new b (/home/$user/.local/share/code-server/extensions/ms-python.python-2020.5.86806/out/client/debugger/debugAdapter/main.js:1:266582)

Error Log File :

debugger.vscode_8d2dc057-6410-479a-8896-afb0ba5c2d69.log

• Web Browser: Chrome Version 85.0.4175.0 (Official Build) dev (64-bit)
• Local OS: Windows / Mac / Chrome Os
• Remote OS: Linux (Debian and Rhel 7)
• Remote Architecture: amd64
• code-server --version: 3.4.1 - 3.2.0

[nhooyr]

@schaffino Yup we reverted the python extension in our marketplace so if you uninstall it and reinstall things work.

[schaffino]

I had the same issue as alan-he. I had updated code-server to 3.4.1 and installed only the ms-python 2020.5.86806 extension, but was getting The number of constructor arguments in the derived class s must be >= than the number of constructor arguments of its base class.

For me it seemed to be some state or setting in ~/.local/share/code-server/. When i wiped this and restarted code-server debugging started working. I copied my user settings back in and everything still works 🤷