how can I set graph in langgraph.json by get_graph function.

[cw-tjdcks106]

how can I set graph in langgraph.json by get_graph function...

./graphs.py

class Graph1:
    def __init__(self):
        self.graph_builder = StateGraph(State)
        ...  # set nodes, edges, ..

    def get_graph():
        graph = self.graph_builder.compile()
        return graph

langgraph.json

{
  "dependencies": ["."],
  "graphs": {
    "my_graph": "./graphs.py:Graph1().get_graph"
  },
  "env": "./.env"
}

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When I run my code through langgraph studio in the above situation, I get the following error...
How can I fix it?

AttributeError: module 'qdjbcyqizgmjhardvipbncht' has no attribute 'Graph1().get_graph'