Problems with tracking a clone source

I'm having some problems with tracking a clone stroke.

I am working on a face where I want to remove the biggest pimples before I use a plug-in for skin smoothing. I found a tutorial and this is what I did:

- I clone stamped one of the pimples
- Then I tracked the motion of the pimple
- I went back to the position of the first frame of the tracking and connected the Clone Position to the Feature Center of the Track Point with the pick whip.
- Then I connected the Position of Transform: Clone Position to the Attach Point of the Track Point.

What seems to happen after this is that the clone source just disappears. I'm kind of sure it has something to do with the Clone Position. Very confusing as I am new to After Effects. Any help will be much appreciated

Thanks, Munzer

motionTracker("Tracker 1")("Track Point 1").featureCenter
motionTracker("Tracker 1")("Track Point 1").attachPoint