[MC-115435] Crash: 'Initializing game' java.lang.NoClassDefFoundError: Could not initialize class com.sun.jna.Native

Whenever I launch the game, it crashes. Output log attached below.

Crash report (17w14a).txt

Description: Initializing game

java.lang.NoClassDefFoundError: Could not initialize class com.sun.jna.Native
	at com.sun.jna.NativeLibrary.<clinit>(NativeLibrary.java:84)
	at com.mojang.text2speech.NarratorWindows.<clinit>(NarratorWindows.java:14)
	at com.mojang.text2speech.Narrator.getNarrator(Narrator.java:17)
	at bhl.<init>(SourceFile:11)
	at bhg.<init>(SourceFile:130)
	at bgr.an(SourceFile:531)
	at bgr.a(SourceFile:381)
	at net.minecraft.client.main.Main.main(SourceFile:123)