[Solved] You wrote this code snippet: flow.add_node(HumanNode('review')) flow.connect('review', 'generate') But it throws an error. What is the likely cause? | LangChain

LangChain - LangGraph for Stateful Agents

You wrote this code snippet:

flow.add_node(HumanNode('review'))
flow.connect('review', 'generate')

But it throws an error. What is the likely cause?

AHumanNode must be instantiated with a named argument like name='review'

BYou cannot connect a human node to an AI node

CThe connect method requires node objects, not strings

DHumanNode cannot be added to LangGraph flows

Step-by-Step Solution

Solution:

Step 1: Check HumanNode instantiation syntax
HumanNode requires named argument 'name', so HumanNode('review') is invalid syntax.
Step 2: Confirm connection method accepts node names as strings
Connecting nodes by their names as strings is valid, so error is not from connect method usage.
Final Answer:
HumanNode must be instantiated with a named argument like name='review' -> Option A
Quick Check:
HumanNode needs name= argument [OK]

Quick Trick: HumanNode requires name= parameter when created [OK]

Common Mistakes:

MISTAKES

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