Bedrock PromptFlow call from Lambda results in 'No input provided for FlowInput node FlowInputNode'

Question

Thanks to Vadim I've gotten this far.
We're doing a POC and we're looking to call certain prompt flows via Lambda from our Bedrock Agent.

Here is the image of the Prompt Flow:
![Enter image description here](/media/postImages/original/IMm08SK4HwThufX50ttFfx1g)

This is the image of the error:
![Enter image description here](/media/postImages/original/IMvLT6nNJqQC6NBiFwOrNIHA)

`Response
{
  "errorMessage": "An error occurred (dependencyFailedException) when calling the InvokeFlow operation: No input provided for FlowInput node FlowInputNode",
  "errorType": "EventStreamError",
  "requestId": "2022b38d-a281-4cdd-acff-9f9fd4f5a95f",
  "stackTrace": [
    "  File "/var/task/dummy_lambda.py", line 48, in lambda_handler
    res = call_first_prompt_flow(input_text)
",
    "  File "/var/task/bedrock_prompt_flows.py", line 38, in call_first_prompt_flow
    for event in response.get("responseStream"):
",
    "  File "/opt/python/botocore/eventstream.py", line 592, in __iter__
    parsed_event = self._parse_event(event)
",
    "  File "/opt/python/botocore/eventstream.py", line 608, in _parse_event
    raise EventStreamError(parsed_response, self._operation_name)
"
  ]
}`

Thanks to someone in the comments for the answer!
![Enter image description here](/media/postImages/original/IM4ugFW5iRQVqYtVgVsS3zQQ)

Andrew · Accepted Answer

I believe that the issue here is that the prompt flow editor names the input node "FlowInputNode" not "FlowInput", which is the name used in the sample. The only way I found to validate this was to introduce an error in the input handing in the editor. The editor will print an error message with the input node name.

AWS-User-kaidin · Answer

Hi,

The error you're encountering, EventStreamError, is related to the AWS Bedrock service, where it states, "No input provided for FlowInput node FlowInputNode." This suggests that the input required by the FlowInputNode was not correctly passed to the flow.

To resolve this issue, you should ensure that the input you're providing in the inputs parameter contains the expected fields and values that the FlowInputNode expects. Here are a few things to check:
* Check the Input Format: Ensure that the inputs field in the invoke_flow function is structured correctly. The FlowInputNode expects specific data, which must match the format and type defined in the flow.
* Validate the Content: Make sure that user_input or whatever data is being passed as content is properly formed and not empty.
* Flow Identifier: Double-check the flowIdentifier and flowAliasIdentifier to ensure they are correctly pointing to the flow you intend to call.

Here’s a general structure that you can refer to for debugging:

inputs=[
    {
        "content": {
            "document": user_input,  # Make sure 'user_input' is valid and contains expected content
        },
        "nodeName": "FlowInputNode",  # Double-check the node name
        "nodeOutputName": "document"  # Ensure this matches the expected output node
    }
]

You can check the content of this worshop as an example. https://github.com/aws-samples/amazon-bedrock-samples/blob/0e205257ab83aa0e65f5ee5a062f25193e53c272/introduction-to-bedrock/Getting_started_with_Prompt_Management_Flows.ipynb#L497

I would suggest to open a case. Our support team should be able to assist you as well.

Bedrock PromptFlow call from Lambda results in 'No input provided for FlowInput node FlowInputNode'

Relevant content