Traceback (most recent call last):


 "<stdin>", line 1, in <module>


 "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/skimage/__init__.py", line 167, in <module>

from .util.dtype import (img_as_float32,


 "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/skimage/util/__init__.py", line 12, in <module>

from ._montage import montage, montage2d


 "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/skimage/util/_montage.py", line 2, in <module>

from .. import exposure


 "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/skimage/exposure/__init__.py", line 1, in <module>

from .exposure import histogram, equalize_hist, \


 "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/skimage/exposure/exposure.py", line 4, in <module>

from ..color import rgb2gray


 "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/skimage/color/__init__.py", line 1, in <module>

from .colorconv import (convert_colorspace,


 "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/skimage/color/colorconv.py", line 60, in <module>

from ..util import dtype, dtype_limits
ImportError: cannot import name dtype

Traceback (most recent call last):


 "/opt/eff.org/certbot/venv/bin/letsencrypt", line 7, in <module>

from certbot.main import main


 "/opt/eff.org/certbot/venv/local/lib/python2.7/site-packages/certbot/main.py", line 10, in <module>

import josepy as jose


 "/opt/eff.org/certbot/venv/local/lib/python2.7/site-packages/josepy/__init__.py", line 41, in <module>

from josepy.interfaces import JSONDeSerializable


 "/opt/eff.org/certbot/venv/local/lib/python2.7/site-packages/josepy/interfaces.py", line 8, in <module>

from josepy import errors, util


 "/opt/eff.org/certbot/venv/local/lib/python2.7/site-packages/josepy/util.py", line 4, in <module>

import OpenSSL


 "/opt/eff.org/certbot/venv/local/lib/python2.7/site-packages/OpenSSL/__init__.py", line 8, in <module>

from OpenSSL import rand, crypto, SSL


 "/opt/eff.org/certbot/venv/local/lib/python2.7/site-packages/OpenSSL/rand.py", line 12, in <module>

from OpenSSL._util import (


 "/opt/eff.org/certbot/venv/local/lib/python2.7/site-packages/OpenSSL/_util.py", line 6, in <module>

from cryptography.hazmat.bindings.openssl.binding import Binding


 "/opt/eff.org/certbot/venv/local/lib/python2.7/site-packages/cryptography/hazmat/bindings/openssl/binding.py", line 13, in <module>

from cryptography.hazmat.bindings._openssl import ffi, lib
ImportError: /opt/eff.org/certbot/venv/local/lib/python2.7/site-packages/cryptography/hazmat/bindings/_openssl.so: cannot enable executable stack as shared object requires: Invalid argument
