I am currently working on .NET to create a chat bot that accesses data from my Azure AI Search Index. My index is only composed of text and no images. I followed the steps specified in the Azure documentation (link: https://learn.microsoft.com/en-us/azure/ai-services/openai/use-your-data-quickstart?tabs=command-line%2Cpython-new&pivots=programming-language-csharp) And chose the without Streaming option, but I get the following error:
HTTP 400 (InvalidRequest) The deployed GPT model does not support Vision Enhancement and On Your Data (OYD) with images.

#pragma warning disable AOAI001
    public async Task<string> SearchIndex(string IndexName, string prompt)
    {

        _searchClient = _searchIndexClient.GetSearchClient(IndexName);

        _options = new();
        
        _options.AddDataSource(new AzureSearchChatDataSource()
        {
            Endpoint = new Uri(_searchEndpoint),
            IndexName = IndexName,
            Authentication = DataSourceAuthentication.FromApiKey(_searchKey),
            InScope = true,
        });

        try
        {

            **ChatCompletion completion = _chatClient.CompleteChat([new UserChatMessage(prompt)], _options);**

            AzureChatMessageContext onYourDataContext = completion.GetAzureMessageContext();

            if (onYourDataContext?.Intent is not null)
            {

                Console.WriteLine($"Intent: {onYourDataContext.Intent}");

            }
            foreach (AzureChatCitation citation in onYourDataContext?.Citations ?? [])
            {

                Console.WriteLine($"Citation: {citation.Content}");

            }

            return completion.Content[0].Text;

        }

        catch (Exception ex)
        {

            Console.WriteLine(ex.Message.ToString());
            return ex.Message.ToString();

        }

    }

The error originates from the CompleteChat call.

I would appreciate your help on this issue!

The goal of the method is to answer user prompt using a specific index.