title: django runserver Unable to configure handler 'file': 'ConvertingTuple' object has no attribute 'startswith'
body: <pre><code>LOGGING = {
      'version': 1,
      'disable_existing_loggers': False,
      'handlers': {
          'file': {
              'level': 'DEBUG',
              'class': 'logging.FileHandler',
              'filename': LOG_FILE,
          },
      },
      'loggers': {
          'django.request': {
              'handlers': ['file'],
              'level': 'DEBUG',
              'propagate': True,
          },
      },
  
  }
  
  
  
  Traceback (most recent call last):
    File "manage.py", line 11, in &lt;module&gt;
      execute_from_command_line(sys.argv)
    File "/home/jie/Sandbox/python3.4/lib/python3.4/site-packages/django/core/management/__init__.py", line 338, in execute_from_command_line
      utility.execute()
    File "/home/jie/Sandbox/python3.4/lib/python3.4/site-packages/django/core/management/__init__.py", line 312, in execute
      django.setup()
    File "/home/jie/Sandbox/python3.4/lib/python3.4/site-packages/django/__init__.py", line 17, in setup
      configure_logging(settings.LOGGING_CONFIG, settings.LOGGING)
    File "/home/jie/Sandbox/python3.4/lib/python3.4/site-packages/django/utils/log.py", line 86, in configure_logging
      logging_config_func(logging_settings)
    File "/usr/lib/python3.4/logging/config.py", line 789, in dictConfig
      dictConfigClass(config).configure()
    File "/usr/lib/python3.4/logging/config.py", line 565, in configure
      '%r: %s' % (name, e))
  ValueError: Unable to configure handler 'file': 'ConvertingTuple' object has no attribute 'startswith'
  
  
      enter code here
  </code></pre>