Crashed whilst initializing - tried to access field com.sun.jna.Pointer.peer from class com.sun.jna.PointerTool

Minecraft Crash Report ----
// Don't do that.

Time: 6/10/17 6:36 PM
Description: Initializing game

java.lang.IllegalAccessError: tried to access field com.sun.jna.Pointer.peer from class com.sun.jna.PointerTool
at com.sun.jna.PointerTool.getPeer(PointerTool.java:13)
at ca.weblite.objc.mappers.NSObjectMapping.cToJ(NSObjectMapping.java:38)
at ca.weblite.objc.TypeMapper.cToJ(TypeMapper.java:122)
at ca.weblite.objc.RuntimeUtils.msg(RuntimeUtils.java:626)
at ca.weblite.objc.Client.send(Client.java:164)
at ca.weblite.objc.Client.sendProxy(Client.java:344)
at ca.weblite.objc.Client.sendProxy(Client.java:369)
at com.mojang.text2speech.NarratorOSX.<init>(NarratorOSX.java:12)
at com.mojang.text2speech.Narrator.getNarrator(Narrator.java:22)
at bit.<init>(SourceFile:15)
at bit.<clinit>(SourceFile:14)
at bio.<init>(SourceFile:127)
at bhz.aq(SourceFile:557)
at bhz.a(SourceFile:404)
at net.minecraft.client.main.Main.main(SourceFile:123)

A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------

– Head –
Thread: Client thread
Stacktrace:
at com.sun.jna.PointerTool.getPeer(PointerTool.java:13)
at ca.weblite.objc.mappers.NSObjectMapping.cToJ(NSObjectMapping.java:38)
at ca.weblite.objc.TypeMapper.cToJ(TypeMapper.java:122)
at ca.weblite.objc.RuntimeUtils.msg(RuntimeUtils.java:626)
at ca.weblite.objc.Client.send(Client.java:164)
at ca.weblite.objc.Client.sendProxy(Client.java:344)
at ca.weblite.objc.Client.sendProxy(Client.java:369)
at com.mojang.text2speech.NarratorOSX.<init>(NarratorOSX.java:12)
at com.mojang.text2speech.Narrator.getNarrator(Narrator.java:22)
at bit.<init>(SourceFile:15)
at bit.<clinit>(SourceFile:14)
at bio.<init>(SourceFile:127)
at bhz.aq(SourceFile:557)

– Initialization –
Details:
Stacktrace:
at bhz.a(SourceFile:404)
at net.minecraft.client.main.Main.main(SourceFile:123)