Mining proxy raspberry

salve avrei un piccolo problema a far funzionare il mining proxy sul mio raspberry dopo aver installato tutte le librerie e il twisted di pyton mi lancio il mining proxy e restituisce questo errore,

pi@raspberrypi:~/stratum-mining-proxy $ ./mining_proxy.py
/usr/local/lib/python2.7/dist-packages/zope.interface-4.4.2-py2.7-linux-armv6l.egg/zope/__init__.py:3: UserWarning: Module twisted was already imported from /usr/local/lib/python2.7/dist-packages/Twisted-17.5.0-py2.7-linux-armv6l.egg/twisted/__init__.pyc, but /usr/local/lib/python2.7/dist-packages/autobahn-17.8.1-py2.7.egg is being added to sys.path
import pkg_resources
Traceback (most recent call last):
File "./mining_proxy.py", line 67, in <module>
from twisted.internet import reactor, defer
File "/usr/local/lib/python2.7/dist-packages/Twisted-17.5.0-py2.7-linux-armv6l.egg/twisted/internet/reactor.py", line 38, in <module>
from twisted.internet import default
File "/usr/local/lib/python2.7/dist-packages/Twisted-17.5.0-py2.7-linux-armv6l.egg/twisted/internet/default.py", line 56, in <module>
install = _getInstallFunction(platform)
File "/usr/local/lib/python2.7/dist-packages/Twisted-17.5.0-py2.7-linux-armv6l.egg/twisted/internet/default.py", line 44, in _getInstallFunction
from twisted.internet.epollreactor import install
File "/usr/local/lib/python2.7/dist-packages/Twisted-17.5.0-py2.7-linux-armv6l.egg/twisted/internet/epollreactor.py", line 24, in <module>
from twisted.internet import posixbase
File "/usr/local/lib/python2.7/dist-packages/Twisted-17.5.0-py2.7-linux-armv6l.egg/twisted/internet/posixbase.py", line 18, in <module>
from twisted.internet import error, udp, tcp
File "/usr/local/lib/python2.7/dist-packages/Twisted-17.5.0-py2.7-linux-armv6l.egg/twisted/internet/tcp.py", line 28, in <module>
from twisted.internet._newtls import (
File "/usr/local/lib/python2.7/dist-packages/Twisted-17.5.0-py2.7-linux-armv6l.egg/twisted/internet/_newtls.py", line 21, in <module>
from twisted.protocols.tls import TLSMemoryBIOFactory, TLSMemoryBIOProtocol
File "/usr/local/lib/python2.7/dist-packages/Twisted-17.5.0-py2.7-linux-armv6l.egg/twisted/protocols/tls.py", line 63, in <module>
from twisted.internet._sslverify import _setAcceptableProtocols
File "/usr/local/lib/python2.7/dist-packages/Twisted-17.5.0-py2.7-linux-armv6l.egg/twisted/internet/_sslverify.py", line 38, in <module>
TLSVersion.TLSv1_1: SSL.OP_NO_TLSv1_1,
AttributeError: 'module' object has no attribute 'OP_NO_TLSv1_1'

cosa posso fare?