Dock's icon disappears on Mavericks

After I updated LINE app through App Store, LINE's icon disappeared both in Dock and launchpad.

To recover it, I followed the procedure described in:

https://discussions.apple.com/thread/5476991

All the icons were recovered, however, I lost most of icons in Dock.

I also tried:

$cd ~/Library/Application Support/Dock

$rm *.db

then I shutdown my Mac and start with option+command+P+R pushed down to delete PRAM.

However, Dock's icon cannot be recovered.

How can I recover them?