ValidationError: 2 validation errors for HumanMessage at v1.0.0a59

[songjinu]

Describe the bug
ValidationError: 2 validation errors for HumanMessage at v1.0.0a59
I connect ChatInput - OpenAI without Prompt.

ValidationError: 2 validation errors for HumanMessage
                             content
                               str type expected (type=type_error.str)
                             content
                               value is not a valid list (type=type_error.list)

\src\backend\base\langflow\base\models\model.py:104 in get_chat_result                                       │ 
                             │                                                                                                                               │ 
                             │   101 │   │   │   │   │   else:                                                                                               │ 
                             │   102 │   │   │   │   │   │   messages.append(input_value.to_lc_message())                                                    │ 
                             │   103 │   │   │   else:                                                                                                       │ 
                             │ ❱ 104 │   │   │   │   messages.append(HumanMessage(content=input_value))                                                      │ 
                             │   105 │   │   inputs = messages or {}                                                                                         │ 
                             │   106 │   │   if stream:                                                                                                      │ 
                             │   107 │   │   │   return runnable.stream(inputs)                                          

Browser and Version

• Version [v1.0.0a59]

Screenshots

[dosubot]

To resolve the ValidationError when connecting ChatInput to OpenAI without a prompt, you need to ensure that the input_value is correctly formatted as a HumanMessage. The error indicates that the content field is expected to be a string but is being provided as a list, or vice versa.

Here's how you can fix it:

1. Ensure input_value is a string: When adding input_value to the messages list, it should be a string. If input_value is already a Record, you need to convert it to a HumanMessage correctly.

2. Modify the get_chat_result function: Ensure that input_value is properly converted to a HumanMessage.

Here is the relevant part of the code that needs to be checked and possibly modified:

def get_chat_result(self, runnable: BaseChatModel, stream: bool, input_value: str, system_message: Optional[str] = None):
    messages: list[Union[HumanMessage, SystemMessage]] = []
    if not input_value and not system_message:
        raise ValueError("The message you want to send to the model is empty.")
    if system_message:
        messages.append(SystemMessage(content=system_message))
    if input_value:
        messages.append(HumanMessage(content=input_value))
    if stream:
        return runnable.stream(messages)
    else:
        message = runnable.invoke(messages)
        result = message.content
        if isinstance(message, AIMessage):
            status_message = self.build_status_message(message)
            self.status = status_message
        else:
            self.status = result
        return result

Ensure that input_value is a string when passed to HumanMessage:

if input_value:
    if isinstance(input_value, Record):
        input_value = input_value.get_text()  # Convert Record to string
    messages.append(HumanMessage(content=input_value))

This ensures that input_value is correctly formatted as a string before being used to create a HumanMessage ^[1][2].

To continue talking to Dosu, mention @dosu.

[Madhavan]

Already reported earlier at #2182 for a58 and continues to be an issue with a59 version as well.

[Nicolò Boschi]

Is the problem still there with langflow 1.0.5?

[Nicolò Boschi]

Duplicate of #2182