Issue with ms-python debug adapter - constructor args mismatch

[frozen-icecube]

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 : microsoft/vscode-python@650e4a9

This was working fine until 2 days ago.
A similar jira has been filed here : microsoft/vscode-python#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/$user/.local/share/code-server/extensions/ms-python.python-2020.5.86806/out/client/debugger/debugAdapter/main.js:16:49631
at Array.forEach ()
at e (/home/$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]

cc @cmoog

[pdckxd]

Works fine if I downgrade to old python extention

Name: Python
Id: ms-python.python
Description: Linting, Debugging (multi-threaded, remote), Intellisense, Jupyter Notebooks, code formatting, refactoring, unit tests, snippets, and more.
Version: 2020.5.86806
Publisher: ms-python
VS Marketplace Link: ?itemName=ms-python.python

[frozen-icecube]

The solution is to not only downgrade ms-python to 2020.5.x but also upgrade code-server to 3.4.1

[frozen-icecube]

Closing since a workaround exists. Also ms-python team is looking into fixing it properly on their end.

[alan-he]

Codeserver v3.4.1 + ms-python 2020.5.86806 still get Debugger Error: The number of constructor arguments in the derived class s must be >= than the number of constructor arguments of its base class.

[frozen-icecube]

Make sure your downloaded the correct 3.4.1. The wrong one is at the top and suggests to scroll down to get the correct 3.4.1

[alan-he]

Make sure your downloaded the correct 3.4.1. The wrong one is at the top and suggests to scroll down to get the correct 3.4.1

I'm definitely sure that i downloaded the right v3.4.1, the second one, not the top

[frozen-icecube]

In that case I wonder what's wrong because the correct 3.4.1+2020.5.x is working fine for me..

[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 🤷

[nhooyr]

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

[schaffino]

@nhooyr
This was with the extensions left as they were and not reinstalled. We are restricting extension installation and the install directory isn't writable by the code-server user.

[WhitCrow]

@nhooyr
This was with the extensions left as they were and not reinstalled. We are restricting extension installation and the install directory isn't writable by the code-server user.

update to ms-python.python-2020.8.106424, the errors be corrected