text: Title: SearchGraph error while follwing the example
  Body: ```
  from search_graph import SearchGraph
  
  # Define the prompt and configuration
  prompt = "What is Chioggia famous for?"
  config = {
      "llm": {"model": "gpt-3.5-turbo"}
  }
  
  # Create the search graph
  search_graph = SearchGraph(prompt, config)
  
  # Run the search graph
  result = search_graph.run()
  
  print(result)
  ```
  
  this gives this error even I didn't modified the code. any idea how to fix this error?
  
  ```
  Exception has occurred: OutputParserException
  Invalid json output: {
      "answer": {
          "Chioggia is famous for offering a more authentic Italian experience compared to Venice, having a significant fishing industry and a rich history tied to the Venetian Republic, featuring a must-visit fish market with a wide variety of fresh seafood, and providing an excellent dining experience at Baia dei Porci with a focus on local seafood dishes."
      }
  }
  json.decoder.JSONDecodeError: Expecting ':' delimiter: line 4 column 5 (char 382)
  
  The above exception was the direct cause of the following exception:
  
    File "/home/dongwook/Project/auto_crawl/toy.py", line 18, in <module>
      raw_result = search_graph.run()
  langchain_core.exceptions.OutputParserException: Invalid json output: {
      "answer": {
          "Chioggia is famous for offering a more authentic Italian experience compared to Venice, having a significant fishing industry and a rich history tied to the Venetian Republic, featuring a must-visit fish market with a wide variety of fresh seafood, and providing an excellent dining experience at Baia dei Porci with a focus on local seafood dishes."
      }
  }
  ```