环境：python3.7.5
Httprunner：3.1.4
在我本机是运行 ok 的，但是放 jenkins 上执行就报了这个错误，重新安装也没有用。有大佬知道怎么回事吗？

2020-09-10 19:12:02.255 | INFO | httprunner.make:__make:512 - make path: /var/lib/jenkins/workspace/cos_qa_tools/cos_api_test/testsuites/cos_old/login_test.py
2020-09-10 19:12:02.255 | INFO | httprunner.make:format_pytest_with_black:170 - format pytest cases with black ...
2020-09-10 19:12:02.279 | ERROR | httprunner.make:format_pytest_with_black:189 -
missing dependency tool: black
install black manually and try again:
$ pip install black

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Build step 'Execute shell' marked build as failure
Finished: FAILURE