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[Bug]: Detected mismatched Protobuf Gencode/Runtime major versions #192
Description
What happened?
Trying to run the sample code in python directory from https://github.com/google-a2a/a2a-samples and getting this error after following the instructions here
cd samples/python/agents/a2a_mcp
uv venv # (if not already done)
source .venv/bin/activate
Note: Change the host and port as needed.
uv run src/a2a_mcp/agents/ --agent-card agent_cards/orchestrator_agent.json --port 10101
File "/Users/xxxxx/Public/xxxx/a2a-samples/samples/python/agents/a2a_mcp/.venv/lib/python3.13/site-packages/google/protobuf/runtime_version.py", line 50, in _ReportVersionError
raise VersionError(msg)
google.protobuf.runtime_version.VersionError: Detected mismatched Protobuf Gencode/Runtime major versions when loading a2a.proto: gencode 6.31.1 runtime 5.29.5. Same major version is required. See Protobuf version guarantees at https://protobuf.dev/support/cross-version-runtime-guarantee.
Relevant log output
Code of Conduct
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Activity
rajeshvelicheti commentedon Jun 13, 2025
This should be addressed with #189
You can also upgrade your potobuf runtime, pip install --upgrade protobuf (or pip install protobuf>=6.31.1) as a workaround.
sanjeevbiswasautodesk commentedon Jun 13, 2025
I am sorry but looks like your python code samples repo is broken , i have added the dependency and installed pip install protobuf and now i got this error,
uv run src/a2a_mcp/agents/ --agent-card agent_cards/orchestrator_agent.json --port 10101
× No solution found when resolving dependencies:
╰─▶ Because google-ai-generativelanguage==0.6.15 depends on one of:
protobuf>=3.20.2,<4.21.0
protobuf>4.21.5,<6.0.0.dev0
and google-generativeai==0.8.5 depends on
google-ai-generativelanguage==0.6.15, we can conclude that
google-generativeai==0.8.5 depends on one of:
protobuf>=3.20.2,<4.21.0
protobuf>4.21.5,<6.0.0.dev0
sanjeevbiswasautodesk commentedon Jun 19, 2025
uv add "a2a-sdk==0.2.5" worked for me