When I use Prompt Generator, I got a error: Failed to generate rule config. Error: [openai] Error: 1 validation error for LLMResult\nmodel\n Input should be a valid string

[yanfzhang]

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Dify version

0.14.2

Cloud or Self Hosted

Self Hosted (Docker)

Steps to reproduce

Workflow works fine but not in Prompt Generator

error response:
"Failed to generate rule config. Error: [openai] Error: 1 validation error for LLMResult\nmodel\n Input should be a valid string [type=string_type, input_value=None, input_type=NoneType]\n For further information visit https://errors.pydantic.dev/2.9/v/string_type"

✔️ Expected Behavior

Works fine in the Prompt Generator

❌ Actual Behavior

Not work in Prompt Generator

[dosubot]

@yanfzhang Hello there! I'm here to help you with any bugs, questions, or contributions you may have. Let's work together to resolve the issue you're experiencing.

The error "1 validation error for LLMResult: Input should be a valid string" in the Prompt Generator occurs because the parse method in the RuleConfigGeneratorOutputParser class expects the "prompt" and "opening_statement" fields in the input to be valid strings. If these fields are not strings, a ValueError is raised, which is then caught and re-raised as an OutputParserError.

To resolve this issue, ensure that the input text being parsed contains a valid JSON markdown with "prompt" and "opening_statement" fields as strings. Additionally, verify that the invoke_llm method in the LLMGenerator class returns a response where response.message.content is a string, as the code expects this to be the case when casting to str ^[1][2].

To continue talking to Dosu, mention @dosu.

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[yanfzhang]

My mistake. I encapsulated the OpenAPI interface, but the response did not include the parameter model.