I have a Raspberry Pi 3 running Jessie with fresh installation of Evok. I am also using Python 3.4. I received the error, "TypeError: 'NoneType' object is not subscriptable." The workaround Tomas referred to on Nov 25, 2016, worked, but I first had to install jsonrpclib-pelix, a version of jsonrpclib updated for Python 3. The standard jsonrpclib does not work with Python 3.