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Hi, i'm trying to get on minecraft 1.4.7 to play a EJM, and I get this crash message:

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\sansj\AppData\Roaming\.minecraft\crash-reports\crash-2017-01-30_14.36.01-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 88d7ccc --------
Full report at:
C:\Users\sansj\AppData\Roaming\.minecraft\crash-reports\crash-2017-01-30_14.36.01-client.txt
Please show that file to Mojang, NOT just this screen!

Generated 1/30/17 2:36 PM

-- System Details --
Details:
Minecraft Version: 1.4.7
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: 51375776 bytes (48 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: AMD Radeon HD 5450 GL version 4.5.13399 Compatibility Profile Context 15.201.1151.1008, ATI Technologies Inc.
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 bn.a(SourceFile:56)
at bn.a(SourceFile:91)
at net.minecraft.client.Minecraft.a(SourceFile:249)
at asq.a(SourceFile:56)
at net.minecraft.client.Minecraft.run(SourceFile:515)
at java.lang.Thread.run(Thread.java:745)
--- END ERROR REPORT d20bdcf4 ----------

Could somebody please tell me how to fix this? I am not using any mods.

Post C:\Users\sansj\AppData\Roaming\.minecraft\crash-reports\crash-2017-01-30_14.36.01-client.txt

---- Minecraft Crash Report ----
// Would you like a cupcake?

Time: 1/30/17 2:36 PM
Description: Failed to start game

java.lang.NullPointerException
at java.io.Reader.<init>(Reader.java:78)
at java.io.InputStreamReader.<init>(InputStreamReader.java:97)
at bn.a(SourceFile:56)
at bn.a(SourceFile:91)
at net.minecraft.client.Minecraft.a(SourceFile:249)
at asq.a(SourceFile:56)
at net.minecraft.client.Minecraft.run(SourceFile:515)
at java.lang.Thread.run(Thread.java:745)

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

-- System Details --
Details:
Minecraft Version: 1.4.7
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: 51375776 bytes (48 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: AMD Radeon HD 5450 GL version 4.5.13399 Compatibility Profile Context 15.201.1151.1008, ATI Technologies Inc.
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

Error in your game files. Try a reinstall? http://hopper.minecraft.net/help/guides/reinstalling-minecraft/