Agent with Ollama can't find OllamaLanguageModelInstruction api. about langchain HOT 2 OPEN

var provider = new OllamaProvider(
            "http://localhost:11434",
            options: new RequestOptions
            {
                Temperature = 0,
                Stop = new[] { "Observation", "[END]" }, // add injection word `Observation` and `[END]` to stop the model(just as additional safety feature)
            });
        var model = new OllamaChatModel(provider, id: "llama3").UseConsoleForDebug();