run-llama/llama_index · error · ValueError

Unexpected kwargs: {kwargs}

Error message

Unexpected kwargs: {kwargs}

What it means

Error "Unexpected kwargs: {kwargs}" thrown in run-llama/llama_index.

Source

Thrown at llama-index-core/llama_index/core/memory/simple_composable_memory.py:53

    secondary_memory_sources: List[SerializeAsAny[BaseMemory]] = Field(
        default_factory=list, description="Secondary memory sources."
    )

    @classmethod
    def class_name(cls) -> str:
        """Class name."""
        return "SimpleComposableMemory"

    @classmethod
    def from_defaults(
        cls,
        primary_memory: Optional[BaseMemory] = None,
        secondary_memory_sources: Optional[List[BaseMemory]] = None,
        **kwargs: Any,
    ) -> "SimpleComposableMemory":
        """Create a simple composable memory from an LLM."""
        if kwargs:
            raise ValueError(f"Unexpected kwargs: {kwargs}")

        primary_memory = primary_memory or ChatMemoryBuffer.from_defaults()
        secondary_memory_sources = secondary_memory_sources or []

        return cls(
            primary_memory=primary_memory,
            secondary_memory_sources=secondary_memory_sources,
        )

    def _format_secondary_messages(
        self, secondary_chat_histories: List[List[ChatMessage]]
    ) -> str:
        """Formats retrieved historical messages into a single string."""
        # TODO: use PromptTemplate for this
        formatted_history = "\n\n" + DEFAULT_INTRO_HISTORY_MESSAGE + "\n"
        for ix, chat_history in enumerate(secondary_chat_histories):
            formatted_history += (
                f"\n=====Relevant messages from memory source {ix + 1}=====\n\n"

View on GitHub (pinned to afd0fef371)

Solutions

1. Remove the unexpected keyword arguments from the constructor call.
2. Pass only supported arguments such as primary_memory and secondary_memory_sources.

When it happens

Trigger: Thrown at llama-index-core/llama_index/core/memory/simple_composable_memory.py:53 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of run-llama/llama_index@afd0fef371 (2026-08-15). Data as JSON: /api/errors/5eefa1fb4b3d5afd. Report an issue: GitHub.