when i click multiplayer on minecraft pc it crashes

Please attach the crash report ([minecraft|http://hopper.minecraft.net/help/finding-minecraft-data-folder]/crash-reports/crash-<DATE>-client.txt), otherwise we can not diagnose this issue.
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Minecraft Crash Report ----
// Don't be sad, have a hug! <3

Time: 6/27/16 1:36 PM
Description: Rendering screen

java.lang.IllegalArgumentException: bad Base64 input character at 6497: 0 (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 bhm.c(SourceFile:212)
at bhm.a(SourceFile:145)
at bed.a(SourceFile:25)
at bei.b(SourceFile:410)
at bei.a(SourceFile:210)
at bhj.a(SourceFile:295)
at bnz.a(SourceFile:1062)
at bcx.av(SourceFile:991)
at bcx.a(SourceFile:396)
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 bhm.c(SourceFile:212)
at bhm.a(SourceFile:145)
at bed.a(SourceFile:25)
at bei.b(SourceFile:410)
at bei.a(SourceFile:210)
at bhj.a(SourceFile:295)

– Screen render details –
Details:
Screen name: bhj
Mouse location: Scaled: (269, 152). Absolute: (807, 441)
Screen size: Scaled: (534, 300). Absolute: (1600, 900). Scale factor of 3
Stacktrace:
at bnz.a(SourceFile:1062)
at bcx.av(SourceFile:991)
at bcx.a(SourceFile:396)
at net.minecraft.client.main.Main.main(SourceFile:124)

– System Details –
Details:
Minecraft Version: 1.10.2
Operating System: Windows 7 (amd64) version 6.1
Java Version: 1.8.0_25, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 55804688 bytes (53 MB) / 193388544 bytes (184 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: 1.10.2
LWJGL: 2.9.4
OpenGL: Intel(R) HD Graphics Family GL version 3.0.0 - Build 8.15.10.2253, 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: Yes
Is Modded: Probably not. Jar signature remains and client brand is untouched.
Type: Client (map_client.txt)
Resource Packs:
Current Language: English (UK)
Profiler Position: N/A (disabled)
CPU: 4x Intel(R) Core(TM) i5-2300 CPU @ 2.80GHz

Your servers.dat is corrupted. Delete minecraft/servers.dat.

Please attach your servers.dat file from your Minecraft directory to MC-38385, else it will be difficult to find the cause