Не работает Grab, не пойму что за ошибка.

$python ggg.py 
Traceback (most recent call last):
  File "ggg.py", line 5, in <module>
    m = Grab(log_file='out.html')
  File "/home/src/virtualenvs/py2.7/lib/python2.7/site-packages/grab/base.py", line 240, in __init__
    self.setup_transport(transport)
  File "/home/src/virtualenvs/py2.7/lib/python2.7/site-packages/grab/base.py", line 254, in setup_transport
    mod = __import__(mod_path, globals(), locals(), ['foo'])
  File "/home/src/virtualenvs/py2.7/lib/python2.7/site-packages/grab/transport/curl.py", line 18, in <module>
    import pycurl
  File "build/bdist.linux-x86_64/egg/pycurl.py", line 7, in <module>
  File "build/bdist.linux-x86_64/egg/pycurl.py", line 6, in __bootstrap__
ImportError: pycurl: libcurl link-time ssl backend (nss) is different from compile-time ssl backend (openssl)

 from grab import Grab

m = Grab(log_file='out.html')
m.go('http://ya.ru')