The notification-applet don't find the specified icons into the correct folder.
I didn't find the icons anywhere in the computer therefore I downloaded the corresponding files.
You may just extract the archive, which is in attachment into this folder
/usr/share/kde4/apps/amarok/icons/hicolor/22x22/actions
yes !!!
I found a solution to this bug
The notification-applet don't find the specified icons into the correct folder.
I didn't find the icons anywhere in the computer therefore I downloaded the corresponding files.
You may just extract the archive, which is in attachment into this folder kde4/apps/ amarok/ icons/hicolor/ 22x22/actions
/usr/share/
You must be administrator !