What is the problem?
I'm trying to set up OctoApp, but the app does not want to connect. It gives HTTP error 500. The error traceback in the Octoprint log is below:
Mar 01 23:38:20 server octoprint[89081]: 2023-03-01 23:38:20,399 - octoprint - ERROR - Exception on /api/currentuser [GET]
Mar 01 23:38:20 server octoprint[89081]: Traceback (most recent call last):
Mar 01 23:38:20 server octoprint[89081]: File "/home/octoprint/OctoPrint/lib/python3.9/site-packages/flask/app.py", line 2073, in wsgi_app
Mar 01 23:38:20 server octoprint[89081]: response = self.full_dispatch_request()
Mar 01 23:38:20 server octoprint[89081]: File "/home/octoprint/OctoPrint/lib/python3.9/site-packages/flask/app.py", line 1519, in full_dispatch_request
Mar 01 23:38:20 server octoprint[89081]: rv = self.handle_user_exception(e)
Mar 01 23:38:20 server octoprint[89081]: File "/home/octoprint/OctoPrint/lib/python3.9/site-packages/flask/app.py", line 1515, in full_dispatch_request
Mar 01 23:38:20 server octoprint[89081]: rv = self.preprocess_request()
Mar 01 23:38:20 server octoprint[89081]: File "/home/octoprint/OctoPrint/lib/python3.9/site-packages/flask/app.py", line 1857, in preprocess_request
Mar 01 23:38:20 server octoprint[89081]: rv = self.ensure_sync(before_func)()
Mar 01 23:38:20 server octoprint[89081]: File "/home/octoprint/OctoPrint/lib/python3.9/site-packages/octoprint/server/__init__.py", line 1427, in before_request
Mar 01 23:38:20 server octoprint[89081]: g.locale = self._get_locale()
Mar 01 23:38:20 server octoprint[89081]: File "/home/octoprint/OctoPrint/lib/python3.9/site-packages/octoprint/server/__init__.py", line 1352, in _get_locale
Mar 01 23:38:20 server octoprint[89081]: return Locale.parse(request.accept_languages.best_match(LANGUAGES))
Mar 01 23:38:20 server octoprint[89081]: File "/home/octoprint/OctoPrint/lib/python3.9/site-packages/babel/core.py", line 317, in parse
Mar 01 23:38:20 server octoprint[89081]: raise TypeError(f"Unexpected value for identifier: {identifier!r}")
Mar 01 23:38:20 server octoprint[89081]: TypeError: Unexpected value for identifier: None
What did you already try to solve it?
Googling it 
Have you tried running in safe mode?
Yes
Did running in safe mode solve the problem?
No, same error
Systeminfo Bundle
You can download this in OctoPrint's System Information dialog ... no bundle, no support!)
octoprint-systeminfo-20230301234452.zip (27.1 KB)
Additional information about your setup
OctoPrint version, OctoPi version, printer, firmware, browser, operating system, ... as much data as possible
OctoPrint on Debian installed with the octoprint_install.sh script. All software is latest at 01-03-2023.
