। ॥ ४७७ ॥
In plain words
"Superimposition happens only on something real that is standing right in front of you" — no one who knows ever made that a rule. What causes it here is error, and nothing else.
Close to the Sanskrit
"Let it be superimposed only on an object, a thing, standing in front" — such a rule has not been made by the wise; delusion alone is the cause here.