title: How to solve Read-only file system problem?
body: <p>I've upgraded to the latest OS on MAC (Catalina), but now I have problem with <code>virtualenv</code>, <code>python</code> and <code>django</code>.</p>
  
  <p>When I do <code>source ve37/bin/activate</code> it's fine, but when I then do <code>python manage.py runserver</code> I get error as follow <strong>OSError: [Errno 30] Read-only file system: '/data'</strong></p>
  
  <p><strong>The full error is as follows:</strong></p>
  
  <pre><code>Traceback (most recent call last):
    File "manage.py", line 11, in &lt;module&gt;
      execute_from_command_line(sys.argv)
    File "/Users/my_name/Projects/my_project/ve37/lib/python3.7/site-packages/django/core/management/__init__.py", line 381, in execute_from_command_line
      utility.execute()
    File "/Users/my_name/Projects/my_project/ve37/lib/python3.7/site-packages/django/core/management/__init__.py", line 325, in execute
      settings.INSTALLED_APPS
    File "/Users/my_name/Projects/my_project/ve37/lib/python3.7/site-packages/django/conf/__init__.py", line 57, in __getattr__
      self._setup(name)
    File "/Users/my_name/Projects/my_project/ve37/lib/python3.7/site-packages/django/conf/__init__.py", line 44, in _setup
      self._wrapped = Settings(settings_module)
    File "/Users/my_name/Projects/my_project/ve37/lib/python3.7/site-packages/django/conf/__init__.py", line 107, in __init__
      mod = importlib.import_module(self.SETTINGS_MODULE)
    File "/Users/my_name/Projects/my_project/ve37/lib/python3.7/importlib/__init__.py", line 127, in import_module
      return _bootstrap._gcd_import(name[level:], package, level)
    File "&lt;frozen importlib._bootstrap&gt;", line 1006, in _gcd_import
    File "&lt;frozen importlib._bootstrap&gt;", line 983, in _find_and_load
    File "&lt;frozen importlib._bootstrap&gt;", line 953, in _find_and_load_unlocked
    File "&lt;frozen importlib._bootstrap&gt;", line 219, in _call_with_frames_removed
    File "&lt;frozen importlib._bootstrap&gt;", line 1006, in _gcd_import
    File "&lt;frozen importlib._bootstrap&gt;", line 983, in _find_and_load
    File "&lt;frozen importlib._bootstrap&gt;", line 967, in _find_and_load_unlocked
    File "&lt;frozen importlib._bootstrap&gt;", line 677, in _load_unlocked
    File "&lt;frozen importlib._bootstrap_external&gt;", line 728, in exec_module
    File "&lt;frozen importlib._bootstrap&gt;", line 219, in _call_with_frames_removed
    File "/Users/my_name/Projects/my_project/Autralis/Autralis/__init__.py", line 2, in &lt;module&gt;
      from .celery import app as celery_app
    File "/Users/my_name/Projects/my_project/Autralis/Autralis/celery.py", line 4, in &lt;module&gt;
      from Autralis import settings
    File "/Users/my_name/Projects/my_project/Autralis/Autralis/settings.py", line 431, in &lt;module&gt;
      os.makedirs(GENERATED_ROOT)
    File "/Users/my_name/Projects/my_project/ve37/bin/../lib/python3.7/os.py", line 211, in makedirs
      makedirs(head, exist_ok=exist_ok)
    File "/Users/my_name/Projects/my_project/ve37/bin/../lib/python3.7/os.py", line 221, in makedirs
      mkdir(name, mode)
  OSError: [Errno 30] Read-only file system: '/data'
  </code></pre>
  
  <p>Yesterday, before updating everything worked fine.</p>
  
  <p>Any idea?</p>