documentation contribution, i got error running server

after install smolagents prepare for document contribution below

```
pip install -e .
pipenv install git+https://github.com/huggingface/doc-builder@main
pipenv install watchdog
```

when i try to run these command,
```
doc-builder build smolagents docs/source/en/ --build_dir ~/tmp/test-build.
doc-builder preview smolagents docs/source/en/
```

i got error

```
raise type(e)(f"There was an error when converting {file} to the MDX format.\n" + e.args[0]) from e
ValueError: There was an error when converting docs/source/en/reference/agents.md to the MDX format.
Unable to find AzureOpenAIServerModel in smolagents. Make sure the path to that object is correct.
```

Can you advise how to fix?