Error in module 4 - sub_graphs.py when running LangGraph Studio

LangChain Academy
1

I’m trying to run LangGraph Studio in module 4 and I get this error in the sub_graphs.py file:

TypeError: StateGraph.__init__() missing 1 required positional argument: 'state_schema'

Looks like the fix is in line 70. When I edit that line to:

qs_builder = StateGraph(QuestionSummarizationState)

LangGraph Studio runs fine. Looks like in new versions of LangGraph StateGraph doesn’t accept input or output parameters?

2

LangGraph Studio runs fine. Looks like in new versions of LangGraph StateGraph doesn’t accept input or output parameters?

v0.5 and up accepts input_schema and output_schema instead! Also, state_schema is indeed required.