c.LocalControllerLauncher.controller_cmd = ['/usr/bin/python2', '-m',
    'ipyparallel.controller']
c.LocalEngineLauncher.engine_cmd = ['/usr/bin/python2', '-m',
    'ipyparallel.engine']
c.LocalEngineSetLauncher.engine_cmd = ['/usr/bin/python2', '-m',
    'ipyparallel.engine']
Change IPython 3 for Python 3 kernel to python2 for the cluster too