[Bug]: ModuleNotFoundError: No module named 'a2a.server.apps'

[NilavoBoral]

What happened?

Importing A2AStarletteApplication from a2a.server.apps raises a ModuleNotFoundError.
I encountered this error in line 3 of the following file from the official samples repository:
samples/python/agents/helloworld/main.py

The file contains:

from a2a.server.apps import A2AStarletteApplication

Error Traceback:

ModuleNotFoundError: No module named 'a2a.server.apps'

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What I Checked :

• Verified the installed package version using pip show a2a-sdk
• Explored the GitHub repository structure
• Looked inside the server directory in the repository
• Could not find any apps module under a2a/server

Environment :

• OS: Windows
• Python version: 3.14.4
• a2a-sdk version: 1.0.0

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Relevant log output

----> 1 from a2a.server.apps import A2AStarletteApplication

ModuleNotFoundError: No module named 'a2a.server.apps'

Code of Conduct

• I agree to follow this project's Code of Conduct

[sokoliva]

Hi @NilavoBoral, the helloworld sample is using the pre released 1.0-alpha version and is currently being updated to use the newly released 1.0 version PR 527. You can read more about breaking changes and the migration from v0.3 to v1.0 here: A2A Python SDK Migration Guide: v0.3 → v1.0