error you must provide a model parameter | OpenAI | Page 1

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I am getting this:

[/home/asus/Projects/chatgpt.v/chatgpt/client.v:45] json.encode(body): {"model":"text-davinci-003","prompt":"Hello","max_tokens":256,"n":1,"temperature":0,"top_p":1,"frequency_penalty":0,"presence_penalty":0,"best_of":1}
{
    "error": {
        "message": "you must provide a model parameter",
        "type": "invalid_request_error",
        "param": null,
        "code": null
    }
}

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and yes, i have the token header correct

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the response is the 2nd part

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1st part is the sent JSON

#error you must provide a model parameter