.Net: Bug: OllamaPromptExecutionSettings with GetChatMessageContentsAsync = System.InvalidCastException:

[mphacker]

Describe the bug
System.InvalidCastException: 'Unable to cast object of type 'System.Double' to type 'System.Nullable`1[System.Int32]'.' when using OllamaPromptExecutionSettings with GetChatMessageContentsAsync

To Reproduce
Steps to reproduce the behavior:

1. create an instance of OllamaPromptExecutionSettings and set the Temperature and NumPredict properties.
2. Execute var chatResponse = await chatCompletionService.GetChatMessageContentsAsync(ChatHistory,settings);
3. Error is thrown

Expected behavior
Response from local LLM.

Screenshots
N/A

Platform

• Language: C#
• Source: Ollama connector: NuGet 1.35.0-alpha, SK: NuGet: 1.35.0
• AI model: Ollama local
• IDE: Visual Studio
• OS: Windows

Additional context
If I remove the settings parameter from the GetchatMessageContentsAsync I get a valid response from the LLM.

[sphenry]

@RogerBarreto can you take a look?

[RogerBarreto]

@mphacker Using the following code with the latest version worked as expected.

var builder = Kernel.CreateBuilder();
var modelId = "llama3.2";
var endpoint = new Uri("http://localhost:11434");

builder.Services.AddOllamaChatCompletion(modelId, endpoint);
var kernel = builder.Build();
var chatCompletionService = kernel.GetRequiredService<IChatCompletionService>();
var settings = new OllamaPromptExecutionSettings { Temperature = 0.5f, NumPredict = 10 };

Console.Write("> ");

string? input = null;
while ((input = Console.ReadLine()) is not null)
{
    Console.WriteLine();

    try
    {
        ChatMessageContent chatResult = await chatCompletionService.GetChatMessageContentAsync(input, settings, kernel);
        Console.Write($"\n>>> Result: {chatResult}\n\n> ");
    }
    catch (Exception ex)
    {
        Console.WriteLine($"Error: {ex.Message}\n\n> ");
    }
}

Closing this ticket as fixed.