"function DoRoll (Point, Axis, Angle, Duration)" Does Not Work on Android. Any reasons?

 function DoRoll (Point,Axis,Angle,Duration) { 
  
  var tSteps = Mathf.Ceil(Duration * 30.0);  
  var tAngle = Angle / tSteps;  
  var pos : Vector3; // declare variable to fix the y position  
    
 // Rotate the cube by the point, axis and angle  
   for (var i = 1; i <= tSteps; i++)   
   {   
     transform.RotateAround (Point, Axis, tAngle);  
     yield WaitForSeconds(0.0033333);  
   }   
    
 // move the targetpoint to the center of the cube   
    transform.Find("targetpoint").position = transform.position;  
   
 // Make sure the y position is correct   
    pos = transform.position;  
    pos.y = startY;  
    transform.position = pos;  
       
 // Make sure the angles are snaping to 90 degrees.       
    var vec: Vector3 = transform.eulerAngles;  
    vec.x = Mathf.Round(vec.x / 90) * 90;  
    vec.y = Mathf.Round(vec.y / 90) * 90;  
    vec.z = Mathf.Round(vec.z / 90) * 90;  
    transform.eulerAngles = vec;  
       
 // The cube is stoped  
    ismoving = false;       
 }  

Here is my script. I have no Idea why does it gives t$$anonymous$$s error "Operator '*' cannot be used with a left hand side of type 'Object' and a right hand side of type 'float'." So I need your help. I tried to find answer in another questions like that, but unfortunately, i haven't.

The Error is in line " var tSteps = Mathf.Ceil(Duration * 30.0);
var tAngle = Angle / tSteps;
var pos : Vector3; // declare variable to fix the y position "

And The code is created by following instructions on "http://forum.unity3d.com/threads/how-to-move-camera-automatically.16190/"

And how to set "function DoRoll (Point,Axis,Angle,Duration) { " to "DoRoll(Vector3.zero, Vector3.up, 90.0, 1.0);"