C# / JSON - Invoke a method with a List

I am having a lot of trouble on my code, I am trying to make some sort of parser. Basically I am trying to get data from a JSON file, and use that data to call methods from my code.

Here's a basic example of my JSON file { "story": { "Talk": [ "me", 1, 1 ] } }

Now I have a class called DialogueSystem, it contains a function called Talk with three parameters, string, int, int.

I am using SimpleJSON to get my JSON data, but I am guessing it's similar to other JSON parsers.

Also, I have other functions which have different parameters which is why I am forced to use reflection

Anyways, here's the code that gets the json data, and tries to use Reflection to call the Talk method.

            // Gets the JSON and parses it
            JSONNode Node = JSONNode.Parse(jsonFile());
            var method = sys.GetType().GetMethod(""); // Reflection stuff

            foreach (JSONNode item in Node["story"].Keys) // the Keys just gives me every key that's in the story node/key
            {
                List<object> parameters = new List<object>(); // List containing the parameters, to be used when invoking the method

                for (int i = 0; i < Node["story"][item].Count; i++)
                {
                    //This part tests if it's a string or int and adds it as such
                    string data = Node["story"][item][i];
                    int n;
                    bool isNum = int.TryParse(data, out n);

                    if (isNum)
                    {
                        parameters.Add(n);
                    }
                    else
                    {
                        parameters.Add(data);
                    }
                }
                // Invoke the method using it's method name and the method parameters
                method.Invoke(item, parameters.ToArray());

            }

Btw, my talk class just prints a text based on the given input.

For some reason, I get this error NullReferenceException: Object reference not set to an instance of an object Dialogue.StoryTeller.ReadStory (Dialogue.DialogueSystem sys) (at Assets/Dialogue System/Scripts/StoryTeller.cs:57)

If you have any idea how to fix it, or maybe make it better, that would be awesome!

Thanks!