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 calling subgraphs multiple times within a single LangGraph node with checkpointing enabled for each subgraph. This is currently not allowed due to internal restrictions on how checkpoint namespacing for subgraphs works.

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Troubleshooting

The following may help resolve this error:
  • If you don’t need to interrupt/resume from a subgraph, pass checkpointer: false when compiling it like this: .compile({ checkpointer: false })
  • Don’t imperatively call graphs multiple times in the same node, and instead use the Send API.