Checkpoint script problems - C#

Questions & Answers
1

I'm trying to write a checkpoint script, which requires use of a singleton, forcing me to work in C# instead of javascript. I know next to nothing about coding in C#, and the Unity documentation for it is frankly awful, so I'm having a hell of a time getting anything to work.

What I want to do is to save a float called checkpoint into the singleton, which can then be accessed and changed by outside javascript scripts. However, I can't get any of it working. Here's the C# code I currently have:

using UnityEngine;
public class MySingleton: MonoBehaviour
{
    private static MySingleton instance;

    public MySingleton () 
    {
        if (instance != null)
        {
            //Debug.Log("Cannot have two instances of singleton. Self destruction in 3...");
            return;
        }

        instance = this;
    }

    public static MySingleton Instance
    {
        get
        {
            if (instance == null)
            {
                new MySingleton ();
            }

            return instance;
        }
    }
    public float checkpoint = 0;
    void Update(){
    Debug.Log(checkpoint);
    }
}

However, when it's I die and the level resets, I get the following error:

ArgumentException: CompareBaseObjects  can only be called from the main thread.
Constructors and field initializers will be executed from the loading thread when loading a scene.
Don't use this function in the constructor or field initializers, instead move initialization code to the Awake or Start function.

If i remove the : Monobehaviour from the 2nd line, I don't get that error, but the Debug.Log line fails to work. No matter which way I have it though, on resetting the level, checkpoint resets to 0, defeating the point of the thing in the first place.

Please help, it's only a few days to my deadline, and I wasn't expecting to have to learn C# all of a sudden >_<.

Thanks

2

"which requires use of a singleton, forcing me to work in C# instead of javascript"

Where did you get that idea? You can make singletons in Javascript.

Something like this:

private static var Instance : MySingletonClass = new MySingletonClass();

public static function GetInstance() : MySingletonClass
{
    return Instance;
}