langgraph.errors.InvalidUpdateError: Must write to at least one of ['keys']

[gulamsarvar-bluebash]

[vbarda]

@gulamsarvar-bluebash could you please provide more information? what's the actual state definition? how are you invoking the graph?
also, your langgraph library version is a bit old, i would suggest updating

[vbarda]

additionally, i would suggest keeping track of all of the keys separately in the state, i.e. make query, context and use_openai keys in your state (vs just a single key keys)

[vbarda]

thanks -- how do you invoke the graph after you compile it?
in your example you would need to do something like graph.invoke({"keys": {...}})

re: keeping track of state keys separately, i mean defining your state as

class GraphState(TypedDict):
    query: str
    context: str
    use_openai: bool

and then you can use it in your node as

query = state["query"]
context = state["context"]
use_openai = state.get("user_openai", True)

you would need to pass those values in when you invoke your graph though, or have upstream nodes set those values in the state updates, i.e. return {"query": ..., "context": ...} instead of return {"keys": ...}