Crash: Ollama use

[XinyueZ]

Traceback (most recent call last):
  File "/app/main.py", line 794, in <module>
    asyncio.run(main())
  File "/usr/lib/python3.12/asyncio/runners.py", line 194, in run
    return runner.run(main)
           ^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.12/asyncio/runners.py", line 118, in run
    return self._loop.run_until_complete(task)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.12/asyncio/base_events.py", line 687, in run_until_complete
    return future.result()
           ^^^^^^^^^^^^^^^
  File "/app/main.py", line 778, in main
    async for chunk_dict in generator:
  File "/opt/venv/lib/python3.12/site-packages/langgraph/pregel/main.py", line 2939, in astream
    async for _ in runner.atick(
  File "/opt/venv/lib/python3.12/site-packages/langgraph/pregel/_runner.py", line 295, in atick
    await arun_with_retry(
  File "/opt/venv/lib/python3.12/site-packages/langgraph/pregel/_retry.py", line 137, in arun_with_retry
    return await task.proc.ainvoke(task.input, config)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/venv/lib/python3.12/site-packages/langgraph/_internal/_runnable.py", line 706, in ainvoke
    input = await asyncio.create_task(
            ^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/venv/lib/python3.12/site-packages/langgraph/_internal/_runnable.py", line 465, in ainvoke
    ret = await asyncio.create_task(coro, context=context)
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/venv/lib/python3.12/site-packages/langgraph/prebuilt/chat_agent_executor.py", line 655, in acall_model
    response = cast(AIMessage, await static_model.ainvoke(model_input, config))  # type: ignore[union-attr]
                               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/venv/lib/python3.12/site-packages/langchain_core/runnables/base.py", line 3290, in ainvoke
    input_ = await coro_with_context(part(), context, create_task=True)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/venv/lib/python3.12/site-packages/langchain_core/runnables/base.py", line 5723, in ainvoke
    return await self.bound.ainvoke(
           ^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/venv/lib/python3.12/site-packages/langchain_core/language_models/chat_models.py", line 417, in ainvoke
    llm_result = await self.agenerate_prompt(
                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/venv/lib/python3.12/site-packages/langchain_core/language_models/chat_models.py", line 1034, in agenerate_prompt
    return await self.agenerate(
           ^^^^^^^^^^^^^^^^^^^^^
  File "/opt/venv/lib/python3.12/site-packages/langchain_core/language_models/chat_models.py", line 992, in agenerate
    raise exceptions[0]
  File "/opt/venv/lib/python3.12/site-packages/langchain_core/language_models/chat_models.py", line 1162, in _agenerate_with_cache
    result = await self._agenerate(
             ^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/venv/lib/python3.12/site-packages/langchain_ollama/chat_models.py", line 998, in _agenerate
    final_chunk = await self._achat_stream_with_aggregation(
                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/venv/lib/python3.12/site-packages/langchain_ollama/chat_models.py", line 785, in _achat_stream_with_aggregation
    async for chunk in self._aiterate_over_stream(messages, stop, **kwargs):
  File "/opt/venv/lib/python3.12/site-packages/langchain_ollama/chat_models.py", line 922, in _aiterate_over_stream
    async for stream_resp in self._acreate_chat_stream(messages, stop, **kwargs):
  File "/opt/venv/lib/python3.12/site-packages/langchain_ollama/chat_models.py", line 727, in _acreate_chat_stream
    chat_params = self._chat_params(messages, stop, **kwargs)
                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/venv/lib/python3.12/site-packages/langchain_ollama/chat_models.py", line 564, in _chat_params
    ollama_messages = self._convert_messages_to_ollama_messages(messages)
                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/venv/lib/python3.12/site-packages/langchain_ollama/chat_models.py", line 705, in _convert_messages_to_ollama_messages
    raise ValueError(msg)
ValueError: Unsupported message content type. Must either have type 'text' or type 'image_url' with a string 'image_url' field.
During task with name 'agent' and id 'c3e3c0b8-974e-f44a-f627-a491c36537e1'

[phanijapps]

@XinyueZ can you share more context on what you were trying to accomplish. I was able to successfully test deepresearch with gpt-oss:20b via ollama.

[XinyueZ]

I believe I didn't do anything special; I just copied the code from the example.