Not compatible with the argument list

I am creating a slider puzzle game and I have come across an error and I have no idea what it means. It is the only error I have within my code and once I correct it my game should finally get to work. Thanks for your help in advance.

The error message I get is below:

Assets/puzzle.js(6,31): BCE0017: The best overload for the method 'UnityEngine.Vector3.Distance(UnityEngine.Vector3, UnityEngine.Vector3)' is not compatible with the argument list '(System.Object)'.

This is the code I am working with:

var emptySlot : Transform;
var xtemp;
var ytemp;

function OnMouseUp() {
	  if (Vector3.Distance(transform.position.emptySlot.position)==1)
		 xtemp = transform.position.x;
		 ytemp = transform.position.y;


if (Vector3.Distance(transform.position, emptySlot.position)==1)

(That’s a comma in the middle of the line, not another fullstop. The compiler is saying there isn’t a version of Distance() that takes a single argument. Arguments are separated by commas.)