AttributeError: 'Babel' object has no attribute 'app'

[epheterson]

Just noticed my Octoprint Docker container is no longer healthy, when I try to load the site I get:

503 Service Unavailable
No server is available to handle this request.

When I check the logs I see:

2023-05-26 16:04:33,588 - octoprint.startup - INFO - ******************************************************************************
2023-05-26 16:04:33,590 - octoprint.startup - INFO - Starting OctoPrint 1.8.7
2023-05-26 16:04:33,590 - octoprint.startup - INFO - Starting in SAFE MODE. Third party plugins will be disabled!
2023-05-26 16:04:33,590 - octoprint.startup - INFO - Reason for safe mode: problem during last startup
2023-05-26 16:04:33,590 - octoprint.startup - INFO - ******************************************************************************
2023-05-26 16:04:33,876 - octoprint.util.connectivity.connectivity_checker - INFO - Connectivity changed from offline to online
2023-05-26 16:04:33,986 - octoprint.util.connectivity.connectivity_checker - INFO - Connectivity state is currently: online
2023-05-26 16:04:33,986 - octoprint.util.connectivity.connectivity_checker - INFO - Connecting to 1.1.1.1:53 is working
2023-05-26 16:04:33,987 - octoprint.util.connectivity.connectivity_checker - INFO - Resolving octoprint.org is working
2023-05-26 16:04:33,991 - octoprint.startup - INFO - Blacklist processing done, adding 3 blacklisted plugin versions: roomtemp (any), GcodeEditor (>=0.1.1,<=0.2.8), gcodeleveling (>=0.1.0,<=0.1.1)
2023-05-26 16:04:33,995 - octoprint.plugin.core - INFO - Loading plugins from /octoprint/plugins/lib/python3.8/site-packages/octoprint/plugins, /octoprint/octoprint/plugins and installed plugin packages...
2023-05-26 16:04:35,234 - octoprint.plugin.core - INFO - Plugin Pi Support Plugin (2022.6.13) did not pass check, not loading.
2023-05-26 16:04:35,289 - octoprint.plugins.errortracking - INFO - Initialized error tracking
2023-05-26 16:04:35,308 - octoprint.plugin.core - INFO - Found 31 plugin(s) providing 17 mixin implementations, 34 hook handlers
2023-05-26 16:04:35,325 - octoprint.server.heartbeat - INFO - Starting server heartbeat, 900.0s interval
2023-05-26 16:04:35,376 - octoprint.cli.server - ERROR - Uncaught exception
Traceback (most recent call last):
  File "/octoprint/plugins/bin/octoprint", line 8, in <module>
    sys.exit(main())
  File "/octoprint/plugins/lib/python3.8/site-packages/octoprint/__init__.py", line 936, in main
    octo(args=args, prog_name="octoprint", auto_envvar_prefix="OCTOPRINT")
  File "/usr/local/lib/python3.8/site-packages/click/core.py", line 1130, in __call__
    return self.main(*args, **kwargs)
  File "/usr/local/lib/python3.8/site-packages/click/core.py", line 1055, in main
    rv = self.invoke(ctx)
  File "/usr/local/lib/python3.8/site-packages/click/core.py", line 1657, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "/usr/local/lib/python3.8/site-packages/click/core.py", line 1404, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "/usr/local/lib/python3.8/site-packages/click/core.py", line 760, in invoke
    return __callback(*args, **kwargs)
  File "/usr/local/lib/python3.8/site-packages/click/decorators.py", line 26, in new_func
    return f(get_current_context(), *args, **kwargs)
  File "/octoprint/plugins/lib/python3.8/site-packages/octoprint/cli/server.py", line 317, in serve_command
    run_server(
  File "/octoprint/plugins/lib/python3.8/site-packages/octoprint/cli/server.py", line 163, in run_server
    octoprint_server.run()
  File "/octoprint/plugins/lib/python3.8/site-packages/octoprint/server/__init__.py", line 374, in run
    self._setup_i18n(app)
  File "/octoprint/plugins/lib/python3.8/site-packages/octoprint/server/__init__.py", line 1497, in _setup_i18n
    LOCALES = babel.list_translations()
  File "/octoprint/plugins/lib/python3.8/site-packages/octoprint/server/util/flask.py", line 78, in fixed_list_translations
    dirs = additional_folders + [os.path.join(self.app.root_path, "translations")]
AttributeError: 'Babel' object has no attribute 'app'
Sentry is attempting to send 1 pending error messages
Waiting up to 2 seconds
Press Ctrl-C to quit

I'm using octoprint:latest container, let me know if you need to know any other variables or info.

[wjcarpenter]

No solution, but "me, too". I switched back to octoprint/octoprint:1.8.7 and things are back to normal (though without the 1.9.0 upgrade, of course).

[proffalken]

Quiet possibly related to OctoPrint/OctoPrint#4744 - although 1.8.7 should have "fixed" any Babel issues AFAICT?

[forsethc]

Same issue here. Reverting to 1.8.7 is my solution for now.

[proffalken]

Fwiw, I've packaged up Octoprint at https://github.com/proffalken/octodoc as a Stopgap.

It works for me, YMMV.

[ahmadyusuf]

I am also having the same issue, I can see this ticket has been open since May, no fix yet?