How to remove blank icon from launchpad after uninstall app?

Question

I have uninstalled an app from Finder->Applications. But in launchpad, icon of the app still exists. How to remove it?

I've tried to restart Mac, no luck.

Screenshot:

Answer 1

You may need to force launchpad to rebuild it's databases. In the Terminal run

rm ~/Library/Application\ Support/Dock/*.db; defaults write com.apple.dock ResetLaunchPad -bool true; killall Dock;

NOTE: this method will re-arrange all of your launchpad icons. – Martin Zhai

Answer 2

Reinstall it and delete it again.

Answer 3

Much easier solution: you have to "long-click", just click and keep it pressed in launchpad. The buttons start to wiggle, the interface is copied from iOS.