Test Failure - Could not import extension sphinxcontrib.shellcheck

[2022/02/25 00:24:13.581] + /opt/python/3.6/bin/python3 setup.py clean

[2022/02/25 00:24:13.581] + /opt/python/3.6/bin/python3 setup.py doc -t

[2022/02/25 00:24:15.706] Extension error:

[2022/02/25 00:24:15.706] Could not import extension sphinxcontrib.shellcheck (exception: No module named 'sphinxcontrib.shellcheck')

[2022/02/25 00:24:15.707] Traceback (most recent call last):

[2022/02/25 00:24:15.707]   File "setup.py", line 345, in <module>

[2022/02/25 00:24:15.707]     **extra_opts

[2022/02/25 00:24:15.707]   File "/opt/python/3.6/lib/python3.6/site-packages/setuptools/__init__.py", line 153, in setup

[2022/02/25 00:24:15.707]     return distutils.core.setup(**attrs)

[2022/02/25 00:24:15.707]   File "/opt/python/3.6/lib/python3.6/distutils/core.py", line 148, in setup

[2022/02/25 00:24:15.707]     dist.run_commands()

[2022/02/25 00:24:15.707]   File "/opt/python/3.6/lib/python3.6/distutils/dist.py", line 955, in run_commands

[2022/02/25 00:24:15.707]     self.run_command(cmd)

[2022/02/25 00:24:15.707]   File "/opt/python/3.6/lib/python3.6/distutils/dist.py", line 974, in run_command

[2022/02/25 00:24:15.707]     cmd_obj.run()

[2022/02/25 00:24:15.707]   File "setup.py", line 168, in run

[2022/02/25 00:24:15.707]     raise RuntimeError("documentation step '%s' failed" % (mode,))

[2022/02/25 00:24:15.707] RuntimeError: documentation step 'doctest' failed