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Type Error expected string or buffer

help me!
i can't download images from this website how can i? and what kind of error is this?
help!!
import urllib
import urllib.request
from bs4 import BeautifulSoup
import urllib.parse
from string import ascii_lowercase

url = 'http://www.southdreamz.com/wp-content/uploads/2010/05/anjali.jpg'

##data = urllib.parse.urlencode(url)
##data = data.encode('utf-8')
req = urllib.request.Request(url, headers= {'User-Agent':'Chrome/24.0.1312.27'})
print(url)
resp = urllib.request.urlretrieve(req, 'hello.jpeg')