I never edited anything. I looked at Game Output(njt12) tab in the launcher when this error shown itself: [09:57:59] [Client thread/WARN]: File minecraft:sounds/mob/ghast/fireball.ogg does not exist, cannot add it to event minecraft:item.fireCharge.use. Here is a screenshot of the error.
Environment
Java 1.8.0_11b12
Windows 8.1
64-bit based operating system
Acer Aspire
Intel Core i3-3227U CPU 1.90GHz
Duplicate of MC-64484