执行tox -egenconfig出现错误genconfig: could not install deps [-r/home/mistral/test-requirements.txt]

通过tox -e genconfig 为Mistral生成配置文件时出现 下面的错误：

[root@vitrage mistral(keystone_admin)]# tox -egenconfig

genconfig create: /home/mistral/.tox/genconfig

genconfig installdeps: -r/home/mistral/test-requirements.txt

ERROR: could not install deps [-r/home/mistral/test-requirements.txt]

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ERROR: genconfig: could not install deps [-r/home/mistral/test-requirements.txt]

解决办法：

rm -rf .tox  # remove everything tox ever did here

sudo pip install --upgrade pip tox virtualenv  # upgrade your tooling (maybe use 'sudo -H ')

tox -e genconfig  # try to build the conf file again