Input.GetKeyDown error

Hi,
I’m trying to access the keyboard for a simple script and the names of the keys I want don’t seem to be working. For example:

function Update () {
		if (Input.GetKeyDown ("LeftControl"))
			print ("Control key was pressed");
	}

This generates the error “UnityException: Input Key named: KeyCode.LeftControl is unknown.”
The Left and right Alt keys don’t seem to work either. Anybody know why? Thanks.

Zaffer

try

if(Input.GetKeyDown(KeyCode.LeftControl))
{
				
}