Icon's disappeared from Launchpad and while active.
I am running High Sierra on my iMac. I have just upgraded to Mohave to my MacBook Pro (Early Retina) The main issue is that (on my iMac) my icons have disappeared from Launchpad, and when they are activated from Launchpad, they do NOT arrive on the operating screen. They instead have a "Default" Icon with a rectangle, Brush, pencil and ruler. Any ideas would be greatly helpful
iMac Line (2012 and Later)