Coding error on Throw()!

datablock ItemData(Grenade)
{
   category = "Mine";
   shapeFile = "~/data/shapes/healthKit.dts";
   mass = 1;
   friction = 1;
   elasticity = 0.3;//use for bounce
   repairAmount = 50;
   maxDamage = 0.2;
   directDamage = 125;
   damageRadius = 20;
   radiusDamage = 150;
   dynamicType = $TypeMasks::DamagableItemObjectType;
       explosion = CrossbowExplosion;
         fadeIn = 0;
};
function Grenade::Explode( %data, %obj, %col )
{

   %obj.setDamageState(Destroyed);
   %obj.schedule(999, "delete");
}

function Grenade::onDestroyed(%data,%obj)
{
   radiusDamage(%obj,%pos,%data.damageRadius,%data.radiusDamage,"Mine",0);
}
function ShapeBase::throwItem(%this,%data,%client){
   // Construct item to throw from the given datablock
   // (with a random rotation around the z axis)
   %item = new Item() {
      dataBlock    = %data;
      rotation     = "0 0 1 " @ (getRandom() * 360);
      sourceObject   = %client.player;
      client       = %client;
   };
   MissionCleanup.add(%item);
    %item.schedule(5555, "explode"); //<------- explode in 5555 miliseconds
   // Call the workhorse throw method...
   %this.throwObject(%item);
}
function ShapeBase::throwObject(%this,%obj){
   // Throw the given object in the direction the shape is
   // looking.  The force values are hardcoded...
   %eye = %this.getEyeVector();
   %vec = vectorScale(%eye, 20);
   // Add a vertical component to give the item a better arc
   
   %dot = vectorDot("0 0 1",%eye);
      if (%dot < 0)
            %dot = -%dot;
      %vec = vectorAdd(%vec,vectorScale("0 0 7",1 - %dot));
      // Add the shape's velocity
      %vec = vectorAdd(%vec,%this.getVelocity());
      // Set the object's position and initial velocity
      %pos = getBoxCenter(%this.getWorldBox());
      %obj.setTransform(%pos);
      %obj.applyImpulse(%pos,%vec);
      // Since the object is thrown from the center of the
      // shape, the object needs to avoid colliding with it&#180;s
      // thrower.
      %obj.setCollisionTimeout(%this);
}