Description

When I run sphinx-build with sphinxcontrib.mermaid 0.9.2 and sphinx 8.1.0, I get this error:

sphinx-build /path/to/docs /path/for/build/output
Running Sphinx v8.1.0
loading translations [en]... done

Extension error:
Could not import extension sphinxcontrib.mermaid (exception: cannot import name 'ExtensionError' from 'sphinx.util' (/path/to/my_env/lib/python3.11/site-packages/sphinx/util/__init__.py))

However, with sphinx 8.0.x, it builds fine.

Steps to reproduce

1. Install sphinxcontrib.mermaid 0.9.2 and sphinx 8.1.0, and add the extension.
2. Run sphinx-build.
3. Build fails.

Screenshots

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Code Sample

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Setup

• Mermaid version: 0.9.2
• sphinx version: 8.1.0

Suggested Solutions

Maybe find alternative to sphinx.util.ExtensionError?
I don't see any explicit reference to dropping it in the sphinx changelog: https://www.sphinx-doc.org/en/master/changes/index.html

Additional Context

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