No More Application Icons?


I don't know how but somehow i seam to loose all the application icons. Both in the folder Applications as well in the Dock. And although some applications have no icon (anymore) in the app-folder, but in the Dock it's still visible. What can be wrong and how to fix? I appreciate your help.
Either a re-install of the OS, or DiskWarrior, however DiskWarrior isn't ready for High Sierra yet. :(
the solution was simple; just a restart of the machine and all the problems disappeared. And thank you all for thinking with me, to find a solution.