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Migrating to django 1.4

First i have fixed the warnings

[Sun Mar 25 21:15:41 2012] [error]   DeprecationWarning
[Sun Mar 25 21:15:42 2012] [error] /usr/lib/python2.5/site-packages/django/conf/__init__.py:75: DeprecationWarning: The ADMIN_MEDIA_PREFIX setting has been removed; use STATIC_URL instead.
[Sun Mar 25 21:15:42 2012] [error]   "use STATIC_URL instead.", DeprecationWarning)
[Sun Mar 25 21:15:42 2012] [error] /usr/lib/python2.5/site-packages/django/core/cache/__init__.py:82: DeprecationWarning: settings.CACHE_* is deprecated; use settings.CACHES instead.
[Sun Mar 25 21:15:42 2012] [error]   DeprecationWarning

so i have deleted the line ADMIN_MEDIA_PREFIX from settings.py and need to configure the "/media" for the admin url also replaced

CACHE_BACKEND = 'locmem://'

with

{
    'default': {
        'BACKEND': 'django.core.cache.backends.locmem.LocMemCache',
    }
}