Error querying SageMaker endpoint

**Link to the notebook**
[Retrieval-Augmented Generation: Question Answering based on Custom Dataset with Open-sourced [LangChain](https://python.langchain.com/en/latest/index.html) Library](https://sagemaker-examples.readthedocs.io/en/latest/introduction_to_amazon_algorithms/jumpstart-foundation-models/question_answering_retrieval_augmented_generation/question_answering_langchain_jumpstart.html)

**Describe the bug**
Query the endpoint
```
payload = {
"text_inputs": question,
"max_length": 100,
"num_return_sequences": 1,
"top_k": 50,
"top_p": 0.95,
"do_sample": True,
}

list_of_LLMs = list(_MODEL_CONFIG_.keys())
list_of_LLMs.remove("huggingface-textembedding-gpt-j-6b") # remove the embedding model

for model_id in list_of_LLMs:
endpoint_name = _MODEL_CONFIG_[model_id]["endpoint_name"]
query_response = query_endpoint_with_json_payload(
json.dumps(payload).encode("utf-8"), endpoint_name=endpoint_name
)
generated_texts = _MODEL_CONFIG_[model_id]["parse_function"](query_response)
print(f"For model: {model_id}, the generated output is: {generated_texts[0]}\n")

```

Gives the following error:

```
ModelError: An error occurred (ModelError) when calling the InvokeEndpoint operation: Received client error (400) from primary with message "{
"code": 400,
"type": "InternalServerException",
"message": "model_fn() takes 1 positional argument but 2 were given"
}
```

**To reproduce**
Dependencies:
`!pip install sagemaker==2.181
!pip install ipywidgets==7.0.0 --quiet
!pip install langchain==0.0.148 --quiet
!pip install faiss-cpu --quiet`

**Logs**

Open the linked question_answering_langchain_jumpstart notebook and reproduce the endpoint query with the listed SageMaker, ipywidgets, LangChain, and faiss-cpu versions. Start at query_endpoint_with_json_payload and the model configuration's parse functions, then investigate the reported model_fn argument error. Done means the notebook queries the endpoints without the 400 ModelError and prints generated output.

Written by the indexing model from the issue text.