Operator '-' cannot be used ... error

Questions & Answers
1

This is my error I think it effects the lines

guitex.pixelInset.x = Screen.width - achievementTex.width - edgeMargin;

guitex.pixelInset.x = Screen.width - achievementTex.width - edgeMargin;

Operator ‘-’ cannot be used with a left hand side of type ‘int’ and a right hand side of type ‘Object’.

#pragma strict

var firstStepTex:Texture;

private var firstStepTaken:boolean;
private var edgeMargin;

function Start(){
	edgeMargin = Screen.width * .01;
}

function playerMoved(){
	if(!firstStepTaken){
		unlockAchievement(firstStepTex);
		firstStepTaken = true;
	}
}

function unlockAchievement(achievementTex:Texture){
	var go:GameObject = new GameObject("Achievement Object");
	go.transform.position = Vector3(0,0,0);
	go.transform.localScale = Vector3(0,0,0);
	var guitex:GUITexture = go.AddComponent(GUITexture) as GUITexture;
	guitex.texture = achievementTex;
	guitex.pixelInset.width = achievementTex.width;
	guitex.pixelInset.height = achievementTex.height;
	guitex.pixelInset.x = Screen.width - achievementTex.width - edgeMargin;
	    	guitex.pixelInset.x = Screen.width - achievementTex.width - edgeMargin;
}
2

You must define the type of all your variables, either explicitly or by supplying a value. This:

private var edgeMargin;

should not be done, since it has no type.