ImportError: No module named _cffi_backend

From: _hexchat_embedded
compiled with cffi version: 1.12.3
_cffi_backend module: not loaded
sys.path: ['/usr/lib/python27.zip', '/usr/lib/python2.7', '/usr/lib/python2.7/plat-darwin', '/usr/lib/python2.7/plat-mac', '/usr/lib/python2.7/plat-mac/lib-scriptpackages', '/usr/lib/python2.7/lib-tk', '/usr/lib/python2.7/lib-old', '/usr/lib/python2.7/lib-dynload', '/Library/Python/2.7/site-packages', '/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python', '/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/PyObjC']

function _hexchat_embedded._on_plugin_init() called, but initialization code failed.  Returning 0.
dbus[49543]: Dynamic session lookup supported but failed: launchd did not provide a socket path, verify that org.freedesktop.dbus-session.plist is loaded!

(hexchat:49543): libnotify-WARNING **: 07:57:32.179: Failed to connect to proxy