Grenade help

#1 When i am going to throw the item by keybinding this is happening well.But when i am doing this by left mouse clik this is giving an error.I modified the code as...

1. in default.bind.cs i added

moveMap.bindCmd(mouse, "button0","commandToServer(\'Crossbowdrop\',\"Crossbow\");", "");

2. In inventory.cs i added this function

function serverCmdCrossbowdrop(%client,%data)
{

%client.getControlObject().throw(%data);
}

3. but in inventory.cs file in the function

function ShapeBase::throw(%this,%data,%amount)
{
// Throw objects from inventory. The onThrow method is
// responsible for decrementing the inventory.
if (%this.getInventory(%data) > 0) {
%obj = %data.onThrow(%this,%amount); ////////// The object is not creating /////

if (%obj) {
%this.throwObject(%obj);
return true;
}
}
return false;
}

%obj did not create.Thats why some other function is not performing.
But when i am doing it by keyboard binding this is happening well.

What is the problem...