The provided input does not match the required type. Expected a 'string' but received a different type. Please adjust the input format to meet the specified constraints.

The 400 status error in the OpenAI API you're encountering is likely due to several possible reasons:

Invalid Request Format

The error message indicates that the input is not of the correct type. Specifically, it states that {'input_variables': ['human_input'], 'template': 'generate an image for little children stroyes that brings the scene to life of three little pigs. Describe the characters, setting, and actions in a way that would captivate a young audience the story Human: {human_input} Chatbot:', '_type': 'prompt'} is not a valid string. This suggests that the API expects a string-type input for the prompt, but instead, it received a more complex data structure.

Incorrect API Request Configuration

The API request might be malformed or contain invalid parameters. This could be due to incorrect syntax or configuration in the request payload, leading the server to understand the request as a "Bad Request".

Input Validation Errors

The OpenAI API has specific validation rules for input data. If the input does not meet these criteria (e.g., if it should be a valid string but is not), the API will return a 400 error.

Excessive Headers

Although less likely in this context, it's worth noting that some recent changes might impose limits on the number of headers in the request. However, this is more relevant to header-related issues rather than payload issues.