Instantiate in a class

Hi, I am farely new to Unity but am having problems with some scripting in Javascript.

I am trying to instantiate and object of a prefab in a class. My current code is as follows:

class unitLine
{
    public var soldierPre : Transform;

    function unitLine()
    {
        GameObject.Instantiate(soldierPre);
    }
};

var Line1 : unitLine;

function Awake()
{
  Line1 = new unitLine();
}

This gives the error "ArgumentException: The thing you are trying to instantiate is null". I have the prefab object applied in the hierachy and not the script itself.

I have searched for more than 2 hours trying to find a solution, but just keep error hopping.

I am also having some problems tryingto access a global variable in my class. Is it possible?

Many thanks to those who can help.

soldierPre is serialized within Line1. When you create a new unitLine, the soliderPre of that unitLine is null. I don't know what you're actually doing, but this could work:

(Your capitalization does not adhere to standards so I modified that.)

class UnitLine {
    var soldierPre : Transform;

    function UnitLine (soldierPre : Transform) {
        this.soldierPre = soldierPre;
        UnityEngine.Object.Instantiate(soldierPre);
    }
}

var line1 : UnitLine;

function Awake() {
    line1 = UnitLine(line1.soldierPre);
}