Error InvokeModel

[Hausdorff94]

I run the cell in Notebook intro_to_bedrock.ipynb

# first fetch possible styles and give options to customer
prompt = """

Human: list different style options for:
""" + customer_input + """

Assistant:"""
body = json.dumps({"prompt": prompt, "max_tokens_to_sample": 500})
modelId = "amazon.titan-text-express-v1"  # change this to use a different version from the model provider
accept = "application/json"
contentType = "application/json"
claudeResponse = ""

response = bedrock_runtime.invoke_model(
    body=body, modelId=modelId, accept=accept, contentType=contentType
)
response_body = json.loads(response.get("body").read())
styles_response = response_body.get("completion")
print(styles_response)

And I got the following error:

ValidationException                       Traceback (most recent call last)
Cell In[5], line 14
     11 contentType = "application/json"
     12 claudeResponse = ""
---> 14 response = bedrock_runtime.invoke_model(
     15     body=body, modelId=modelId, accept=accept, contentType=contentType
     16 )
     17 response_body = json.loads(response.get("body").read())
     18 styles_response = response_body.get("completion")

File /opt/conda/lib/python3.10/site-packages/botocore/client.py:553, in ClientCreator._create_api_method.<locals>._api_call(self, *args, **kwargs)
    549     raise TypeError(
    550         f"{py_operation_name}() only accepts keyword arguments."
    551     )
    552 # The "self" in this scope is referring to the BaseClient.
--> 553 return self._make_api_call(operation_name, kwargs)

File /opt/conda/lib/python3.10/site-packages/botocore/client.py:1009, in BaseClient._make_api_call(self, operation_name, api_params)
   1005     error_code = error_info.get("QueryErrorCode") or error_info.get(
   1006         "Code"
   1007     )
   1008     error_class = self.exceptions.from_code(error_code)
-> 1009     raise error_class(parsed_response, operation_name)
   1010 else:
   1011     return parsed_response

ValidationException: An error occurred (ValidationException) when calling the InvokeModel operation: Malformed input request: 3 schema violations found, please reformat your input and try again.

Any idea how to solve it?

[Hausdorff94]

Update: I was using wrong payload for Titan model