1.12.1 쓰고 있다가, 1.5.2 서버를 한번 접속해 볼까 하여 버젼을 옮겨 보았는데 오류가 나왔습니다.

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-2017-08-27_16.06.42-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 9400ae03 --------
Full report at:
C:\Users\user\AppData\Roaming\.minecraft\crash-reports\crash-2017-08-27_16.06.42-client.txt
Please show that file to Mojang, NOT just this screen!

Generated 17. 8. 27 오후 4:06

-- System Details --
Details:
    Minecraft Version: 1.5.2
    Operating System: Windows 7 (x86) version 6.1
    Java Version: 1.8.0_25, Oracle Corporation
    Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Oracle Corporation
    Memory: 47535048 bytes (45 MB) / 125042688 bytes (119 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 310/PCI/SSE2 GL version 3.2.0, 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>(Reader.java:78)
    at java.io.InputStreamReader.<init>(InputStreamReader.java:97)
    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(Thread.java:745)
--- END ERROR REPORT 6d87966b ----------

어떻게 해야 해결 할 수 있을까요?