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.