Tag

#langgraph-errors

3 posts tagged.

LangGraph Checkpointer Requires 'configurable' Keys: The Real Fix (2026)

"Checkpointer requires one or more of the following 'configurable' keys" means you compiled with a checkpointer and invoked without one. The message names three keys and only thread_id works. Measured in Python and TypeScript (2026).

September 1, 20269 min read35

Tutorials

LangGraph InvalidUpdateError: Fix "Can Receive Only One Value Per Step" (2026)

InvalidUpdateError: Can receive only one value per step means two parallel LangGraph nodes wrote the same state key with no reducer. Reproduce it in 15 lines and fix it the right way in Python and TypeScript (2026).

August 16, 20268 min read135

Tutorials

LangGraph Recursion Limit: Fix GraphRecursionError Properly (2026)

GraphRecursionError means you hit LangGraph's 25-superstep recursion limit. Raise it the right way, find the real infinite loop, and exit gracefully with RemainingSteps.

July 30, 20265 min read233