Toolbar and Launcher app icons
After upgrading my iOS to High Sierra a few of the icons on my toolbar and launcher act as if they can't find the image for the icon. When I look in the applications folder in Finder, all of the apps have their icons. Any ideas on how I can fix this? Below are some pictures to show what I mean. It's affecting the following applications: Notes, Messages, FaceTime, App Store, and Photos.
MacBook Pro (13-inch Mid 2012)