When the launchpad has duplicate icons due to MAC app store download error or other reasons, and the gray duplicate icons cannot be deleted, enter the following code in the terminal to reset the launchpad and eliminate the duplicate icons.
1. Duplicate icon or gray icon appears in Mac OSX 10.10
2. Open the terminal
3. Input in the first step:defaults write com.apple.dock ResetLaunchPad -bool trueCarriage return
4. Input in the second step:killall DockCarriage return
5. At this time, the launchpad will restore the factory settings, and the folder classification you created in launchpad will disappear. Duplicate icons are removed
matters needing attention:The established folder classification will be lost and needs to be re classified.
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