No handlers could be found for logger

I am newbie to Django.I am trying for Django logging now. While trying,I am getting this error ["No handlers could be found for logger "sample" "]..here is my code,

(In my settings.py)

LOGGING = {
    'version': 1,
    'disable_existing_loggers': False,
    'formatters': {
        'simple': {
            'format': '%(asctime)s %(levelname)s %(name)s %(message)s'
        },
    },
    'handlers': {
        'default': {
            'level':'DEBUG',
            'class':'logging.handlers.RotatingFileHandler',
            'filename': '/home/linuxuser/mani/f/logs/msg.log',
            'maxBytes': 1024*1024*5, # 5 MB
            'backupCount': 5,
            'formatter':'simple',
        },
    },
    'loggers': {
        'sample': {
            'handlers': ['default'],
            'level': 'DEBUG',
            'propagate': True,
        },
    }
}

(In my views.py)

import logging
import logging.handlers
from django.conf import settings
logger = logging.getLogger('sample')

def empdel(request,id):
    e = get_object_or_404(emp, pk=id)
    e.delete()
    logger.info('A row is deleted successfully !!!')
    return HttpResponseRedirect('/empthanks/')

While running this code, i got this error ie ["No handlers could be found for logger "sample" "].. Whats wrong with my code? Why i am getting such a error even i am using handler in LOGGING? and also i am trying to save log message into the file that i have used in LOGGING...any idea?? Thanks in advance !!!