Python backend not working on latest release

[davidkydd]

Describe the bug
"Python backend disconnected" in release 2.11, breaks all applications in the Gallery.

To Reproduce
Install latest release 2.11, Login, "Python backend disconnected" shows in bottom title bar

Logs
Navigating to %APPDATA%\BatchExplorer\logs and then opening the most recent python-server.log file shows the following error, which looks related to dependencies:

info: ========================= STARTING PYTHON RPC SERVER PROCESS =========================
info: Traceback (most recent call last):
File "main.py", line 32, in
File "main.py", line 26, in run
File "server\websocket_server.py", line 17, in init
File "site-packages\websockets\imports.py", line 81, in getattr
File "site-packages\websockets\imports.py", line 26, in import_name
ModuleNotFoundError: No module named 'websockets.legacy'
[10356] Failed to execute script main

Version (please complete the following information):

• OS: Windows
• Version 2.11

[themorey]

I'm having the same issue on Mac OSX 12.0.1 Monterey.

versions tried:

2.11.0-stable.541
2.12.0-insider.556
2.12.0-dev (built myself from feature/tenant-picker)

app.log

{"0":"Invalid unit value NaN","level":"error","message":"[BL] Uncaught exception:","timestamp":"2021-11-15T01:41:49.813Z"}
{"level":"info","message":"Websocket connection closed. Retrying to connect in 32s","timestamp":"2021-11-15T01:41:53.587Z"}

python.server.log

info: ========================= STARTING PYTHON RPC SERVER PROCESS =========================
info: Traceback (most recent call last):
  File "main.py", line 32, in <module>
  File "main.py", line 26, in run
  File "server/websocket_server.py", line 17, in __init__
  File "websockets/imports.py", line 81, in __getattr__
  File "websockets/imports.py", line 26, in import_name
ModuleNotFoundError: No module named 'websockets.legacy'
[93271] Failed to execute script main

NOTE: Downgrading to 2.10.0-stable.519 does not have the Websocket.legacy import issue

[dpwatrous]

I see the same issue as well. Looking into it

[dpwatrous]

It looks like some changes the websockets library made to add lazy module loading made PyInstaller stop including some critical files in the build. Switching the imports around fixed the issue. PR #2411