After installing the library in 09-multi-remote-agents-with-a2a.md, “Import ‘a2a.server.apps’ could not be resolved” appears.

[ToshikazuOki]

After following the instructions in https://github.com/MicrosoftLearning/mslearn-ai-agents/blob/main/Instructions/Exercises/09-multi-remote-agents-with-a2a.md and running "pip install -r requirements.txt",
the error "Import ‘a2a.server.apps’ could not be resolved" appears.

Currently, the "a2a-sdk" listed in "requirements.txt" does not specify a version.
As a result, the latest version of the library is installed, but it appears that "A2AStarletteApplication (Server-side components for implementing an A2A agent)" is no longer available.

[vermegi]

This is indeed an issue, I encountered it as well while using these same labfiles for prepping my a2a demo. The a2a functionality seems to have moved to a different package.

[ivorb]

Looks like the new version removed some of those wrapper classes, so we'll need to rework the code. For now, I've locked the requirements.txt for that lab to the latest v0.3 for a2a-sdk, but leaving this issue open until we implement a real fix for the new package version
https://github.com/a2aproject/a2a-python/blob/main/docs/migrations/v1_0/README.md#5-server-application-setup