Web interface not available, traceback in seahub 7.1.4 UnicodeDecodeError

I am running seafile 7.1.4 (self-hosted)

When I try to access the web interface, I get:

Page unavailable

Sorry, but the requested page is unavailable due to a server hiccup.

Our engineers have been notified, so check back later.

The problem started after switching from 7.0.5 to 7.1.4

In the logs/seahub.log file, I see lots of tracebacks like this:

2020-07-22 16:16:25,742 [ERROR] django.request:135 handle_uncaught_exception Internal Server Error: /api2/account/info/
Traceback (most recent call last):
  File "/home/seafile/seafile/seafile-server-7.1.4/seahub/thirdpart/django/core/handlers/exception.py", line 41, in inner
    response = get_response(request)
  File "/home/seafile/seafile/seafile-server-7.1.4/seahub/thirdpart/django/core/handlers/base.py", line 249, in _legacy_get_response
    response = self._get_response(request)
  File "/home/seafile/seafile/seafile-server-7.1.4/seahub/thirdpart/django/core/handlers/base.py", line 187, in _get_response
    response = self.process_exception_by_middleware(e, request)
  File "/home/seafile/seafile/seafile-server-7.1.4/seahub/thirdpart/django/core/handlers/base.py", line 185, in _get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "/home/seafile/seafile/seafile-server-7.1.4/seahub/thirdpart/django/views/decorators/csrf.py", line 58, in wrapped_view
    return view_func(*args, **kwargs)
  File "/home/seafile/seafile/seafile-server-7.1.4/seahub/thirdpart/django/views/generic/base.py", line 68, in view
    return self.dispatch(request, *args, **kwargs)
  File "/home/seafile/seafile/seafile-server-7.1.4/seahub/seahub/api2/base.py", line 23, in dispatch
    response = super(APIView, self).dispatch(*a, **kw)
  File "/home/seafile/seafile/seafile-server-7.1.4/seahub/thirdpart/rest_framework/views.py", line 505, in dispatch
    response = self.handle_exception(exc)
  File "/home/seafile/seafile/seafile-server-7.1.4/seahub/seahub/api2/base.py", line 20, in handle_exception
    return super(APIView, self).handle_exception(exc)
  File "/home/seafile/seafile/seafile-server-7.1.4/seahub/thirdpart/rest_framework/views.py", line 465, in handle_exception
    self.raise_uncaught_exception(exc)
  File "/home/seafile/seafile/seafile-server-7.1.4/seahub/thirdpart/rest_framework/views.py", line 476, in raise_uncaught_exception
    raise exc
  File "/home/seafile/seafile/seafile-server-7.1.4/seahub/thirdpart/rest_framework/views.py", line 502, in dispatch
    response = handler(request, *args, **kwargs)
  File "/home/seafile/seafile/seafile-server-7.1.4/seahub/seahub/api2/views.py", line 338, in get
    return Response(self._get_account_info(request))
  File "/home/seafile/seafile/seafile-server-7.1.4/seahub/seahub/api2/views.py", line 317, in _get_account_info
    url, _, _ = api_avatar_url(email, int(72))
  File "/home/seafile/seafile/seafile-server-7.1.4/seahub/seahub/avatar/util.py", line 42, in cached_func
    return cache.get(key) or cache_set(key, func(user, size))
  File "/home/seafile/seafile/seafile-server-7.1.4/seahub/thirdpart/django/core/cache/backends/filebased.py", line 41, in get
    return pickle.loads(zlib.decompress(f.read()))
UnicodeDecodeError: 'ascii' codec can't decode byte 0xe3 in position 1: ordinal not in range(128)

What does this mean? A bug in seahub or in my setup?

Hope you already looked at those older posts…?

@axstet Didn’t find those posts, very sorry and thanks for pointing me to them.

apt install python3-pylibmc + restarting seafile and seahub does not solve the issue. I cannot upgrade to Ubuntu 20.04 LTS or remove python 2 stuff at this moment due to other dependencies.

Clearing /tmp/seahub_cache + restarting seafile and seahub did the trick.