[BUG]: Error when deploying academic-research agent to vertex AI agent engine

[eguiraud-pf]

Name of sample affected

python/agents/academic-research

Description of issue

Local usage with adk web works. When deploying to Vertex AI, trying to use the model I get this error and no output:

  File "/code/app/api/factory/python_file_api_builder.py", line 473, in _async_stream_json_generator
    async for chunk in output:
  File "/home/appuser/.cache/pypoetry/virtualenvs/reasoning-engine-assembly-service-MATOk_fk-py3.12/lib/python3.12/site-packages/vertexai/preview/reasoning_engines/templates/adk.py", line 1017, in async_stream_query
    async for event in events_async:
  File "/home/appuser/.cache/pypoetry/virtualenvs/reasoning-engine-assembly-service-MATOk_fk-py3.12/lib/python3.12/site-packages/google/adk/runners.py", line 565, in run_async
    async for event in agen:
  File "/home/appuser/.cache/pypoetry/virtualenvs/reasoning-engine-assembly-service-MATOk_fk-py3.12/lib/python3.12/site-packages/google/adk/runners.py", line 550, in _run_with_trace
    async for event in agen:
  File "/home/appuser/.cache/pypoetry/virtualenvs/reasoning-engine-assembly-service-MATOk_fk-py3.12/lib/python3.12/site-packages/google/adk/runners.py", line 782, in _exec_with_plugin
    async for event in agen:
  File "/home/appuser/.cache/pypoetry/virtualenvs/reasoning-engine-assembly-service-MATOk_fk-py3.12/lib/python3.12/site-packages/google/adk/runners.py", line 539, in execute
    async for event in agen:
  File "/home/appuser/.cache/pypoetry/virtualenvs/reasoning-engine-assembly-service-MATOk_fk-py3.12/lib/python3.12/site-packages/google/adk/agents/base_agent.py", line 295, in run_async
    async for event in agen:
  File "/home/appuser/.cache/pypoetry/virtualenvs/reasoning-engine-assembly-service-MATOk_fk-py3.12/lib/python3.12/site-packages/google/adk/agents/llm_agent.py", line 470, in _run_async_impl
    async for event in agen:
  File "/home/appuser/.cache/pypoetry/virtualenvs/reasoning-engine-assembly-service-MATOk_fk-py3.12/lib/python3.12/site-packages/google/adk/flows/llm_flows/base_llm_flow.py", line 752, in run_async
    async for event in agen:
  File "/home/appuser/.cache/pypoetry/virtualenvs/reasoning-engine-assembly-service-MATOk_fk-py3.12/lib/python3.12/site-packages/google/adk/flows/llm_flows/base_llm_flow.py", line 829, in _run_one_step_async
    async for llm_response in agen:
  File "/home/appuser/.cache/pypoetry/virtualenvs/reasoning-engine-assembly-service-MATOk_fk-py3.12/lib/python3.12/site-packages/google/adk/flows/llm_flows/base_llm_flow.py", line 1186, in _call_llm_async
    async for event in agen:
  File "/home/appuser/.cache/pypoetry/virtualenvs/reasoning-engine-assembly-service-MATOk_fk-py3.12/lib/python3.12/site-packages/google/adk/flows/llm_flows/base_llm_flow.py", line 1169, in _call_llm_with_tracing
    async for llm_response in agen:
  File "/home/appuser/.cache/pypoetry/virtualenvs/reasoning-engine-assembly-service-MATOk_fk-py3.12/lib/python3.12/site-packages/google/adk/flows/llm_flows/base_llm_flow.py", line 1245, in _run_and_handle_error
    async for response in agen:
  File "/home/appuser/.cache/pypoetry/virtualenvs/reasoning-engine-assembly-service-MATOk_fk-py3.12/lib/python3.12/site-packages/google/adk/flows/llm_flows/base_llm_flow.py", line 335, in _run_and_handle_error
    raise TypeError(
TypeError: Expected agent to have canonical_on_model_error_callbacks attribute, but got <class 'google.adk.agents.llm_agent.LlmAgent'>"

Environment

europe-west1 region, Vertex AI Agent Engine.
I have tried updating deploy.py so that create uses the latest versions of the libraries, but it does not help.

    remote_agent = agent_engines.create(
        adk_app,
        display_name=root_agent.name,
        requirements=[
            "google-adk (>=1.0.0)",
            "google-cloud-aiplatform[agent_engines] (>=1.93.0)",
            "google-genai (>=1.9.0)",
            "pydantic (>=2.10.6,<3.0.0)",
            "python-dotenv (>=1.0.1)",
        ],
        #        extra_packages=[""],
    )

Reproduction steps or code

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Error log

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[eguiraud-pf]

pinning the versions like this seems to work at the time of writing:

        requirements=[
            "google-adk (==1.18.0)",
            "google-cloud-aiplatform[agent_engines] (>=1.93.0)",
            "google-genai (>=1.9.0)",
            "pydantic (>=2.10.6,<3.0.0)",
            "python-dotenv (>=1.0.1)",
        ],