Python runtime error on gui Authorise account

[ccruzreyes]

Hello, after clicking "Authorise accont" in the gui icon's menu, the proxy caugh the following Exception and the authorisation dialog failed to display:

2025-06-24 12:33:29: Please authorise your account emailexample@outlook.com from the menu
An error occurred when calling message handler
Traceback (most recent call last):
  File "C:\Users\user1\AppData\Local\Programs\Python\Python313\Lib\site-packages\pystray\_win32.py", line 412, in _dispatcher
    return int(icon._message_handlers.get(
               ~~~~~~~~~~~~~~~~~~~~~~~~~~~
        uMsg, lambda w, l: 0)(wParam, lParam) or 0)
        ~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^
  File "C:\Users\user1\AppData\Local\Programs\Python\Python313\Lib\site-packages\pystray\_win32.py", line 224, in _on_notify
    descriptors[index - 1](self)
    ~~~~~~~~~~~~~~~~~~~~~~^^^^^^
  File "C:\Users\user1\AppData\Local\Programs\Python\Python313\Lib\site-packages\pystray\_base.py", line 328, in inner
    callback(self)
    ~~~~~~~~^^^^^^
  File "C:\Users\user1\AppData\Local\Programs\Python\Python313\Lib\site-packages\pystray\_base.py", line 453, in __call__
    return self._action(icon, self)
           ~~~~~~~~~~~~^^^^^^^^^^^^
  File "c:\folder1\email-oauth2-proxy\emailproxy.py", line 3022, in authorise_account
    webview.start(gui=forced_gui, debug=Log.get_level() == logging.DEBUG)
    ~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\user1\AppData\Local\Programs\Python\Python313\Lib\site-packages\webview\__init__.py", line 176, in start
    guilib = initialize(gui)
  File "C:\Users\user1\AppData\Local\Programs\Python\Python313\Lib\site-packages\webview\guilib.py", line 134, in initialize
    if not try_import(guis):
           ~~~~~~~~~~^^^^^^
  File "C:\Users\user1\AppData\Local\Programs\Python\Python313\Lib\site-packages\webview\guilib.py", line 83, in try_import
    if import_func():
       ~~~~~~~~~~~^^
  File "C:\Users\user1\AppData\Local\Programs\Python\Python313\Lib\site-packages\webview\guilib.py", line 72, in import_winforms
    import webview.platforms.winforms as guilib
  File "C:\Users\user1\AppData\Local\Programs\Python\Python313\Lib\site-packages\webview\platforms\winforms.py", line 13, in <module>
    import clr
  File "C:\Users\user1\AppData\Local\Programs\Python\Python313\Lib\site-packages\clr.py", line 6, in <module>
    load()
    ~~~~^^
  File "C:\Users\user1\AppData\Local\Programs\Python\Python313\Lib\site-packages\pythonnet\__init__.py", line 143, in load
    func = assembly.get_function("Python.Runtime.Loader.Initialize")
  File "C:\Users\user1\AppData\Local\Programs\Python\Python313\Lib\site-packages\clr_loader\types.py", line 94, in get_function
    return ClrFunction(self._runtime, self._path, name, func)
  File "C:\Users\user1\AppData\Local\Programs\Python\Python313\Lib\site-packages\clr_loader\types.py", line 58, in __init__
    self._callable = runtime._get_callable(assembly, typename, func_name)
                     ~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\user1\AppData\Local\Programs\Python\Python313\Lib\site-packages\clr_loader\netfx.py", line 49, in _get_callable
    raise RuntimeError(
        f"Failed to resolve {typename}.{function} from {assembly_path}"
    )
RuntimeError: Failed to resolve Python.Runtime.Loader.Initialize from C:\Users\user1\AppData\Local\Programs\Python\Python313\Lib\site-packages\pythonnet\runtime\Python.Runtime.dll

Can anyone help me figure out what's causing this error? Thanks!

[simonrob]

Please could you let me know your operating system version, and also the output of the following two commands:

python --version
python -m pip list

[ccruzreyes]

I'm running the proxy on a Windows Server 2016.

python --version
Python 3.13.4

python -m pip list
Package Version
----------------- -----------
bottle 0.13.4
cffi 1.17.1
clr_loader 0.2.7.post0
cryptography 45.0.4
packaging 25.0
pillow 11.2.1
pip 25.1.1
prompt_toolkit 3.0.51
proxy_tools 0.1.0
pyasyncore 1.0.4
pycparser 2.22
PyJWT 2.10.1
pystray 0.19.5
pythonnet 3.0.5
pywebview 5.4
six 1.17.0
timeago 1.0.16
typing_extensions 4.14.0
wcwidth 0.2.13

[simonrob]

It looks like there is an issue with pywebview in your setup. Does the basic pywebview example work for you?

If not, take a look at that package's installation page – are there any missing dependencies?

[ccruzreyes]

The following basic pywebview example produces the same error:

import webview

window = webview.create_window('Woah dude!', 'https://pywebview.flowrl.com')
webview.start()

I don't see any missing dependencies.
Any idea?

Thank you very much for your help.

[simonrob]

Unfortunately this investigation just shows that the issue is from pywebview rather than the proxy. I'd recommend looking for support directly from that project.