buildbot upgrade-master master is throwing below error
Traceback (most recent call last):
File "/usr/local/bin/buildbot", line 4, in <module>
runner.run()
File "/usr/local/lib/python2.7/dist-packages/buildbot/scripts/runner.py", line 762, in run
subcommandFunction = reflect.namedObject(subconfig.subcommandFunction)
File "/usr/local/lib/python2.7/dist-packages/twisted/python/reflect.py", line 173, in namedObject
module = namedModule('.'.join(classSplit[:-1]))
File "/usr/local/lib/python2.7/dist-packages/twisted/python/reflect.py", line 159, in namedModule
topLevel = __import__(name)
File "/usr/local/lib/python2.7/dist-packages/buildbot/scripts/upgrade_master.py", line 24, in <module>
from buildbot.db import connector
File "/usr/local/lib/python2.7/dist-packages/buildbot/db/connector.py", line 32, in <module>
from twisted.application import internet
File "/usr/local/lib/python2.7/dist-packages/twisted/application/internet.py", line 54, in <module>
from automat import MethodicalMachine
File "/usr/local/lib/python2.7/dist-packages/automat/__init__.py", line 2, in <module>
from ._methodical import MethodicalMachine
File "/usr/local/lib/python2.7/dist-packages/automat/_methodical.py", line 7, in <module>
from inspect import getfullargspec as getArgsSpec
ImportError: cannot import name getfullargspec
Installed Packages: python2.7, python2.7-dev, buildbot=='0.8.12', buildbot-slave=='0.8.12', sqlalchemy=='0.7.10', sqlalchemy-migrate=='0.7.2', jinja2, python-dateutil, twisted==17.9.0