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When the MkDocs configuration file is missing, the build currently fails with an "Unknown error" message. This change raises a clearer and more helpful BuildUserError if the mkdocs.yml file is not found, similar to how Sphinx errors are handled.

Closes #11937

@RabbitAlbatross RabbitAlbatross requested a review from a team as a code owner August 4, 2025 16:25
@RabbitAlbatross RabbitAlbatross requested a review from stsewd August 4, 2025 16:25
Comment on lines +104 to +108
if not os.path.exists(self.yaml_file):
raise BuildUserError(
f"MkDocs configuration file is missing — we could not find a 'mkdocs.yml' file at {self.yaml_file}. "
"Please make sure your repository includes one and try again."
)
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We should follow the same approach we use for Sphinx. See an example at https://github.com/readthedocs/readthedocs.org/blob/main/readthedocs/doc_builder/backends/sphinx.py#L112-L113

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Build: "Unknown" error when mkdocs.yml is not found
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