Multiplayer issues.

I want to get some help from you. As soon as I click the Multiplayer button, it crashes. I don't even try to join a server. I just press the button that says 'multiplayer', minecraft dirt loading screen appears, I crash. I have tried installing missing minecraft files but it didn't work. here is the report format

---- Minecraft Crash Report ----
// You're mean.

Time: 10/06/16 20:45
Description: Rendering screen

java.lang.IllegalArgumentException: bad Base64 input character at 1646: 41 (decimal)
at io.netty.handler.codec.base64.Base64.decode(Base64.java:247)
at io.netty.handler.codec.base64.Base64.decode(Base64.java:197)
at io.netty.handler.codec.base64.Base64.decode(Base64.java:188)
at bgs.c(SourceFile:212)
at bgs.a(SourceFile:145)
at bdj.a(SourceFile:25)
at bdo.b(SourceFile:411)
at bdo.a(SourceFile:210)
at bgp.a(SourceFile:295)
at bnd.a(SourceFile:1056)
at bcd.av(SourceFile:992)
at bcd.a(SourceFile:399)
at net.minecraft.client.main.Main.main(SourceFile:124)


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

-- Head --
Thread: Client thread
Stacktrace:
at io.netty.handler.codec.base64.Base64.decode(Base64.java:247)
at io.netty.handler.codec.base64.Base64.decode(Base64.java:197)
at io.netty.handler.codec.base64.Base64.decode(Base64.java:188)
at bgs.c(SourceFile:212)
at bgs.a(SourceFile:145)
at bdj.a(SourceFile:25)
at bdo.b(SourceFile:411)
at bdo.a(SourceFile:210)
at bgp.a(SourceFile:295)

-- Screen render details --
Details:
Screen name: bgp
Mouse location: Scaled: (204, 140). Absolute: (409, 198)
Screen size: Scaled: (427, 240). Absolute: (854, 480). Scale factor of 2
Stacktrace:
at bnd.a(SourceFile:1056)
at bcd.av(SourceFile:992)
at bcd.a(SourceFile:399)
at net.minecraft.client.main.Main.main(SourceFile:124)

-- System Details --
Details:
Minecraft Version: 1.9.4
Operating System: Windows 10 (amd64) version 10.0
Java Version: 1.8.0_25, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 158057256 bytes (150 MB) / 234078208 bytes (223 MB) up to 2134114304 bytes (2035 MB)
JVM Flags: 6 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx2G -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn128M
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
Launched Version: 1.9.4
LWJGL: 2.9.4
OpenGL: Intel(R) HD Graphics 4000 GL version 4.0.0 - Build 10.18.10.4242, Intel
GL Caps: Using GL 1.3 multitexturing.
Using GL 1.3 texture combiners.
Using framebuffer objects because OpenGL 3.0 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: v2.1.zip, faithful32pack.zip (incompatible), Faithful 1.9 - 16w03a.zip
Current Language: English (UK)
Profiler Position: N/A (disabled)
CPU: bcd$7@649009d6