"Bad marshal data" Django development server error
Question: Got this error while insterting data into my MySQL database

    
    
    ValueError at /admin/arbkdb/arbkcompany/
    bad marshal data (unknown type code)
    Request Method: GET
    Request URL:    http://[2001:6f8:1c00:18b::2]:9000/admin/arbkdb/arbkcompany/
    Django Version: 1.3
    Exception Type: ValueError
    Exception Value:    
    bad marshal data (unknown type code)
    Exception Location: /usr/lib/python2.7/dist-packages/simplejson/__init__.py in <module>, line 111
    Python Executable:  /usr/bin/python
    Python Version: 2.7.2
    Python Path:    
    ['/home/ardian/.experiments/arbk',
     '/usr/lib/python2.7',
     '/usr/lib/python2.7/plat-linux2',
     '/usr/lib/python2.7/lib-tk',
     '/usr/lib/python2.7/lib-old',
     '/usr/lib/python2.7/lib-dynload',
     '/usr/local/lib/python2.7/dist-packages',
     '/usr/lib/python2.7/dist-packages',
     '/usr/lib/python2.7/dist-packages/PIL',
     '/usr/lib/python2.7/dist-packages/gst-0.10',
     '/usr/lib/python2.7/dist-packages/gtk-2.0',
     '/usr/lib/pymodules/python2.7',
     '/usr/lib/python2.7/dist-packages/ubuntu-sso-client',
     '/usr/lib/python2.7/dist-packages/ubuntuone-client',
     '/usr/lib/python2.7/dist-packages/ubuntuone-control-panel',
     '/usr/lib/python2.7/dist-packages/ubuntuone-couch',
     '/usr/lib/python2.7/dist-packages/ubuntuone-installer',
     '/usr/lib/python2.7/dist-packages/ubuntuone-storage-protocol']
    Server time:    Tue, 8 May 2012 16:15:19 -050
    

# Trackback

    
    
    Environment:
    
    
    Request Method: GET
    Request URL: http://[2001:6f8:1c00:18b::2]:9000/admin/arbkdb/arbkcompany/
    
    Django Version: 1.3
    Python Version: 2.7.2
    Installed Applications:
    ['admin_tools',
     'admin_tools.theming',
     'admin_tools.menu',
     'admin_tools.dashboard',
     'django.contrib.auth',
     'django.contrib.contenttypes',
     'django.contrib.sessions',
     'django.contrib.sites',
     'django.contrib.messages',
     'django.contrib.staticfiles',
     'arbkdb',
     'south',
     'django.contrib.admin']
    Installed Middleware:
    ('django.middleware.common.CommonMiddleware',
     'django.contrib.sessions.middleware.SessionMiddleware',
     'django.middleware.csrf.CsrfViewMiddleware',
     'django.contrib.auth.middleware.AuthenticationMiddleware',
     'django.contrib.messages.middleware.MessageMiddleware')
    
    
    Traceback:
    File "/usr/lib/pymodules/python2.7/django/core/handlers/base.py" in get_response
      89.                     response = middleware_method(request)
    File "/usr/lib/pymodules/python2.7/django/contrib/messages/middleware.py" in process_request
      11.         request._messages = default_storage(request)
    File "/usr/lib/pymodules/python2.7/django/contrib/messages/storage/__init__.py" in <lambda>
      31. default_storage = lambda request: get_storage(settings.MESSAGE_STORAGE)(request)
    File "/usr/lib/pymodules/python2.7/django/contrib/messages/storage/__init__.py" in get_storage
      17.         mod = import_module(module)
    File "/usr/lib/pymodules/python2.7/django/utils/importlib.py" in import_module
      35.     __import__(name)
    File "/usr/lib/pymodules/python2.7/django/contrib/messages/storage/user_messages.py" in <module>
      8. from django.contrib.messages.storage.fallback import FallbackStorage
    File "/usr/lib/pymodules/python2.7/django/contrib/messages/storage/fallback.py" in <module>
      2. from django.contrib.messages.storage.cookie import CookieStorage
    File "/usr/lib/pymodules/python2.7/django/contrib/messages/storage/cookie.py" in <module>
      5. from django.utils import simplejson as json
    File "/usr/lib/pymodules/python2.7/django/utils/simplejson/__init__.py" in <module>
      111.     import simplejson
    File "/usr/lib/python2.7/dist-packages/simplejson/__init__.py" in <module>
      111. from decoder import JSONDecoder, JSONDecodeError
    
    Exception Type: ValueError at /admin/arbkdb/arbkcompany/
    Exception Value: bad marshal data (unknown type code)
    

Ps. I am not sure how to describe why it came to this error because it appeard
while inserting a lot of data and I don't know why

This is my model data
<https://github.com/ardian/arbk/blob/master/arbkdb/models.py>


Answer: Looks like is not a database problem but a corrupted files message. Removing
*.pyc and *.pyo files solves this.

