And how can the factor of perceiving effort be miss-perceived?
There is the case where a person, desiring on taking on what is not given, on facing it, is regarding his effort, thinks: "This is an effort on the eye, on the touch on the eye, on the object of the eye, form; on feelings, on consciousness, will and what ever phenomena arises on effort on touch on the eye, and it, the effort, is not real, not lasting, no refuge, not to be regarded as there being an actor, and so there is no effort of taking when taking on it as there is no actor. He regards the ear,... sound... nose,... smell... tongue... taste, ... body..., bodily touch... He regard the effort on intellect, the effort on touch on the intellect, the effort on the object of the intellect, thoughts/ideas; feelings, consciousness, will and what ever phenomena arises on touch on the effort on intelect, as not real, not lasting, no refuge, not to be regarded under ones control, and so there is no effort of taken when taking on it, as there is no actor.
This is how one miss-perceives the fact that there is effort. Rejecting that there is an effort he takes on it althought not given and acts evil unskilful in regard of the actor.
Or he acts on relaying on wrong view objected in the world and denies the effort in regard of there being an actor: although there is effort on desire, there is no actor, being there no actor, there is no heir of efforts effects and fruits.