langchain-ai/langgraph · error · RemoteException

RemoteException

Error message

RemoteException

What it means

Error "RemoteException" thrown in langchain-ai/langgraph.

Source

Thrown at libs/langgraph/langgraph/pregel/remote.py:846

            # raise ParentCommand exception for command events
            if mode == "command" and chunk.data.get("graph") == Command.PARENT:
                raise ParentCommand(Command(**chunk.data))
            # prepend caller ns (as it is not passed to remote graph)
            if caller_ns := (config or {}).get(CONF, {}).get(CONFIG_KEY_CHECKPOINT_NS):
                caller_ns = tuple(caller_ns.split(NS_SEP))
                ns = caller_ns + ns
            # stream to parent stream
            if stream is not None and mode in stream.modes:
                stream((ns, mode, chunk.data))
            # raise interrupt or errors
            if chunk.event.startswith("updates"):
                if isinstance(chunk.data, dict) and INTERRUPT in chunk.data:
                    if caller_ns:
                        raise GraphInterrupt(
                            [Interrupt(**i) for i in chunk.data[INTERRUPT]]
                        )
            elif chunk.event.startswith("error"):
                raise RemoteException(chunk.data)
            # filter for what was actually requested
            if mode not in requested:
                continue

            if chunk.event.startswith("messages"):
                chunk = chunk._replace(data=tuple(chunk.data))

            # emit chunk
            if version == "v2":
                ints: tuple[Interrupt, ...] = ()
                if mode == "values" and isinstance(chunk.data, dict):
                    ints = tuple(
                        Interrupt(**i) if isinstance(i, dict) else i
                        for i in chunk.data.pop(INTERRUPT, ())
                    )
                yield {"type": mode, "ns": ns, "data": chunk.data, "interrupts": ints}
            elif subgraphs:
                if NS_SEP in chunk.event:

View on GitHub (pinned to 38031739e5)

When it happens

Trigger: Thrown at libs/langgraph/langgraph/pregel/remote.py:846 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of langchain-ai/langgraph@38031739e5 (2026-08-26). Data as JSON: /api/errors/19274608c4dcf9e9. Report an issue: GitHub.