Error

Command /home/docs/checkouts/readthedocs.org/user_builds/letterbomb/envs/latest/bin/python -m sphinx -T -E -b html -d _build/doctrees -D language=en . _build/html failed: Running Sphinx v4.4.0 Traceback (most recent call last): File "/home/docs/checkouts/readthedocs.org/user_builds/letterbomb/envs/latest/lib/python3.9/site-packages/sphinx/config.py", line 340, in eval_config_file exec(code, namespace) File "/home/docs/checkouts/readthedocs.org/user_builds/letterbomb/checkouts/latest/docs/conf.py", line 16, in <module> import letterbomb ModuleNotFoundError: No module named 'letterbomb' The above exception was the direct cause of the following exception: Traceback (most recent call last): File "/home/docs/checkouts/readthedocs.org/user_builds/letterbomb/envs/latest/lib/python3.9/site-packages/sphinx/cmd/build.py", line 280, in build_main app = Sphinx(args.sourcedir, args.confdir, args.outputdir, File "/home/docs/checkouts/readthedocs.org/user_builds/letterbomb/envs/latest/lib/python3.9/site-packages/sphinx/application.py", line 209, in __init__ self.config = Config.read(self.confdir, confoverrides or {}, self.tags) File "/home/docs/checkouts/readthedocs.org/user_builds/letterbomb/envs/latest/lib/python3.9/site-packages/sphinx/config.py", line 173, in read namespace = eval_config_file(filename, tags) File "/home/docs/checkouts/readthedocs.org/user_builds/letterbomb/envs/latest/lib/python3.9/site-packages/sphinx/config.py", line 353, in eval_config_file raise ConfigError(msg % traceback.format_exc()) from exc sphinx.errors.ConfigError: There is a programmable error in your configuration file: Traceback (most recent call last): File "/home/docs/checkouts/readthedocs.org/user_builds/letterbomb/envs/latest/lib/python3.9/site-packages/sphinx/config.py", line 340, in eval_config_file exec(code, namespace) File "/home/docs/checkouts/readthedocs.org/user_builds/letterbomb/checkouts/latest/docs/conf.py", line 16, in <module> import letterbomb ModuleNotFoundError: No module named 'letterbomb' Configuration error: There is a programmable error in your configuration file: Traceback (most recent call last): File "/home/docs/checkouts/readthedocs.org/user_builds/letterbomb/envs/latest/lib/python3.9/site-packages/sphinx/config.py", line 340, in eval_config_file exec(code, namespace) File "/home/docs/checkouts/readthedocs.org/user_builds/letterbomb/checkouts/latest/docs/conf.py", line 16, in <module> import letterbomb ModuleNotFoundError: No module named 'letterbomb'