1.9 snapshot crashes when clicking on Minecraft Realms button

Game crashes when clicking on minecraft realms button

---- Minecraft Crash Report ----
// Hey, that tickles! Hehehe!

Time: 16-01-28 11:13
Description: Updating screen events

java.lang.NoClassDefFoundError: net/minecraft/realms/RealmsServerStatusPinger
	at com.mojang.realmsclient.RealmsMainScreen.<clinit>(RealmsMainScreen.java:63)
	at java.lang.Class.forName0(Native Method)
	at java.lang.Class.forName(Class.java:260)
	at net.minecraft.realms.RealmsBridge.switchToRealms(SourceFile:19)
	at bfh.f(SourceFile:267)
	at bfh.a(SourceFile:243)
	at bfa.a(SourceFile:341)
	at bfh.a(SourceFile:498)
	at bfa.k(SourceFile:404)
	at bfa.p(SourceFile:381)
	at bce.s(SourceFile:1563)
	at bce.au(SourceFile:949)
	at bce.a(SourceFile:390)
	at net.minecraft.client.main.Main.main(SourceFile:122)
Caused by: java.lang.ClassNotFoundException: net.minecraft.realms.RealmsServerStatusPinger
	at java.net.URLClassLoader$1.run(URLClassLoader.java:372)
	at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.net.URLClassLoader.findClass(URLClassLoader.java:360)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
	... 14 more


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

-- Head --
Stacktrace:
	at com.mojang.realmsclient.RealmsMainScreen.<clinit>(RealmsMainScreen.java:63)
	at java.lang.Class.forName0(Native Method)
	at java.lang.Class.forName(Class.java:260)
	at net.minecraft.realms.RealmsBridge.switchToRealms(SourceFile:19)
	at bfh.f(SourceFile:267)
	at bfh.a(SourceFile:243)
	at bfa.a(SourceFile:341)
	at bfh.a(SourceFile:498)
	at bfa.k(SourceFile:404)
	at bfa.p(SourceFile:381)

-- Affected screen --
Details:
	Screen name: bfh
Stacktrace:
	at bce.s(SourceFile:1563)
	at bce.au(SourceFile:949)
	at bce.a(SourceFile:390)
	at net.minecraft.client.main.Main.main(SourceFile:122)

-- System Details --
Details:
	Minecraft Version: 16w04a
	Operating System: Windows Vista (amd64) version 6.0
	Java Version: 1.8.0_25, Oracle Corporation
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
	Memory: 143899240 bytes (137 MB) / 235765760 bytes (224 MB) up to 1060372480 bytes (1011 MB)
	JVM Flags: 6 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn128M
	IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
	Launched Version: 16w04a
	LWJGL: 2.9.4
	OpenGL: ATI Mobility Radeon HD 4650 GL version 2.1.8501 Release, ATI Technologies Inc.
	GL Caps: Using GL 1.3 multitexturing.
Using GL 1.3 texture combiners.
Using framebuffer objects because ARB_framebuffer_object is supported and separate blending is supported.
Shaders are available because OpenGL 2.1 is supported.
VBOs are available because OpenGL 1.5 is supported.

	Using VBOs: No
	Is Modded: Probably not. Jar signature remains and client brand is untouched.
	Type: Client (map_client.txt)
	Resource Packs: 
	Current Language: English (US)
	Profiler Position: N/A (disabled)
	CPU: 2x Intel(R) Core(TM)2 Duo CPU T6500 @ 2.10GHz