title: Gunicorn ImportError: cannot import name 'ALREADY_HANDLED' from 'eventlet.wsgi' in docker
body: <p>I had a working code running flask with gunicorn (eventlet worker) in docker. It's also working in production, but on my machine, it started doing this. I can't find anything on google about this thing. What meight be the problem?</p>
  <pre><code>Error: class uri 'eventlet' invalid or not found:
  web_1       |
  web_1       | [Traceback (most recent call last):
  web_1       |   File &quot;/root/.local/lib/python3.7/site-packages/gunicorn/util.py&quot;, line 99, in load_class
  web_1       |     mod = importlib.import_module('.'.join(components))
  web_1       |   File &quot;/usr/local/lib/python3.7/importlib/__init__.py&quot;, line 127, in import_module
  web_1       |     return _bootstrap._gcd_import(name[level:], package, level)
  web_1       |   File &quot;&lt;frozen importlib._bootstrap&gt;&quot;, line 1006, in _gcd_import
  web_1       |   File &quot;&lt;frozen importlib._bootstrap&gt;&quot;, line 983, in _find_and_load
  web_1       |   File &quot;&lt;frozen importlib._bootstrap&gt;&quot;, line 967, in _find_and_load_unlocked
  web_1       |   File &quot;&lt;frozen importlib._bootstrap&gt;&quot;, line 677, in _load_unlocked
  web_1       |   File &quot;&lt;frozen importlib._bootstrap_external&gt;&quot;, line 728, in exec_module
  web_1       |   File &quot;&lt;frozen importlib._bootstrap&gt;&quot;, line 219, in _call_with_frames_removed
  web_1       |   File &quot;/root/.local/lib/python3.7/site-packages/gunicorn/workers/geventlet.py&quot;, line 20, in &lt;module&gt;
  web_1       |     from eventlet.wsgi import ALREADY_HANDLED as EVENTLET_ALREADY_HANDLED
  web_1       | ImportError: cannot import name 'ALREADY_HANDLED' from 'eventlet.wsgi' (/root/.local/lib/python3.7/site-packages/eventlet/wsgi.py)
  web_1       | ]
  </code></pre>