Alpha Notice: These docs cover the v1-alpha release. Content is incomplete and subject to change.For the latest stable version, see the current LangGraph Python or LangGraph JavaScript docs.
You are attempting to use built-in LangGraph persistence without providing a checkpointer. This happens when a checkpointer is missing in the compile() method of StateGraph or entrypoint.

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Troubleshooting

The following may help resolve this error: 
import { InMemorySaver, StateGraph } from "@langchain/langgraph";
const checkpointer = new InMemorySaver();

// Graph API
import { StateGraph } from "@langchain/langgraph";
const graph = new StateGraph(...).compile({ checkpointer });

// Functional API
import { entrypoint } from "@langchain/langgraph";
const workflow = entrypoint(
    { checkpointer, name: "workflow" },
    async (messages: string[]) => {
        // ...
    }
);
  • Use the LangGraph API so you don’t need to implement or configure checkpointers manually. The API handles all persistence infrastructure for you.