Error

Command /home/docs/checkouts/readthedocs.org/user_builds/dffml/envs/latest/bin/python -m sphinx -T -E -b html -d _build/doctrees -D language=en . _build/html failed: Running Sphinx v4.4.0 loading translations [en]... done Traceback (most recent call last): File "/home/docs/checkouts/readthedocs.org/user_builds/dffml/envs/latest/lib/python3.7/site-packages/sphinx/registry.py", line 433, in load_extension mod = import_module(extname) File "/home/docs/checkouts/readthedocs.org/user_builds/dffml/envs/latest/lib/python3.7/importlib/__init__.py", line 127, in import_module return _bootstrap._gcd_import(name[level:], package, level) File "<frozen importlib._bootstrap>", line 1006, in _gcd_import File "<frozen importlib._bootstrap>", line 983, in _find_and_load File "<frozen importlib._bootstrap>", line 953, in _find_and_load_unlocked File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed File "<frozen importlib._bootstrap>", line 1006, in _gcd_import File "<frozen importlib._bootstrap>", line 983, in _find_and_load File "<frozen importlib._bootstrap>", line 965, in _find_and_load_unlocked ModuleNotFoundError: No module named 'sphinx_tabs' The above exception was the direct cause of the following exception: Traceback (most recent call last): File "/home/docs/checkouts/readthedocs.org/user_builds/dffml/envs/latest/lib/python3.7/site-packages/sphinx/cmd/build.py", line 283, in build_main args.tags, args.verbosity, args.jobs, args.keep_going) File "/home/docs/checkouts/readthedocs.org/user_builds/dffml/envs/latest/lib/python3.7/site-packages/sphinx/application.py", line 230, in __init__ self.setup_extension(extension) File "/home/docs/checkouts/readthedocs.org/user_builds/dffml/envs/latest/lib/python3.7/site-packages/sphinx/application.py", line 387, in setup_extension self.registry.load_extension(self, extname) File "/home/docs/checkouts/readthedocs.org/user_builds/dffml/envs/latest/lib/python3.7/site-packages/sphinx/registry.py", line 437, in load_extension err) from err sphinx.errors.ExtensionError: Could not import extension sphinx_tabs.tabs (exception: No module named 'sphinx_tabs') Extension error: Could not import extension sphinx_tabs.tabs (exception: No module named 'sphinx_tabs')