Minecraft has crashed!      
      ----------------------      

Minecraft has stopped running because it encountered a problem; Failed to start game

A full error report has been saved to C:\Users\User\AppData\Roaming\.minecraft\crash-reports\crash-2017-01-21_16.48.56-client.txt - Please include a copy of that file (Not this screen!) if you report this crash to anyone; without it, they will not be able to help fix the crash :(

--- BEGIN ERROR REPORT 34e17587 --------
Full report at:
C:\Users\User\AppData\Roaming\.minecraft\crash-reports\crash-2017-01-21_16.48.56-client.txt
Please show that file to Mojang, NOT just this screen!

Generated 17. 1. 21 오후 4:48

-- System Details --
Details:
    Minecraft Version: 1.5.2
    Operating System: Windows 7 (amd64) version 6.1
    Java Version: 1.8.0_111, Oracle Corporation
    Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
    Memory: 47250208 bytes (45 MB) / 127139840 bytes (121 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
    AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
    Suspicious classes: No suspicious classes found.
    IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
    LWJGL: 2.9.0
    OpenGL: GeForce GTX 750 Ti/PCIe/SSE2 GL version 4.5.0 NVIDIA 376.33, NVIDIA Corporation
    Is Modded: Very likely; Jar signature invalidated
    Type: Client (map_client.txt)
    Texture Pack: Default
    Profiler Position: N/A (disabled)
    Vec3 Pool Size: ~~ERROR~~ NullPointerException: null

java.lang.NullPointerException
    at java.io.Reader.<init>(Unknown Source)
    at java.io.InputStreamReader.<init>(Unknown Source)
    at bp.a(SourceFile:64)
    at bp.a(SourceFile:100)
    at net.minecraft.client.Minecraft.a(SourceFile:252)
    at avv.a(SourceFile:56)
    at net.minecraft.client.Minecraft.run(SourceFile:507)
    at java.lang.Thread.run(Unknown Source)
--- END ERROR REPORT b4fff832 ----------

이렇게 나오면서 버전을 바꾸려고하면 플레이가 불가능합니다 해결방법을 알려주세요