打开minecraft时显示奇怪的东西

Mods loaded: 1
ModLoader 1.2.5

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

Minecraft has stopped running because it encountered a problem.

--- BEGIN ERROR REPORT 9f578458 --------
Generated 15-6-20 下午5:44

Minecraft: Minecraft 1.2.5
OS: Windows 8.1 (x86) version 6.3
Java: 1.7.0_75, Oracle Corporation
VM: Java HotSpot(TM) Client VM (mixed mode), Oracle Corporation
LWJGL: 2.4.2
OpenGL: Intel(R) Iris(TM) Graphics 6100 version 4.3.0 - Build 10.18.14.4112, Intel

java.io.IOException: Couldn't get lock for C:\Program Files\Common Files\minecraft_gensokyo\.minecraft\ModLoader.txt
at java.util.logging.FileHandler.openFiles(Unknown Source)
at java.util.logging.FileHandler.<init>(Unknown Source)
at ModLoader.init(ModLoader.java:876)
at ModLoader.addAllRenderers(ModLoader.java:189)
at ahu.<init>(ahu.java:77)
at ahu.<clinit>(ahu.java:8)
at net.minecraft.client.Minecraft.a(SourceFile:273)
at net.minecraft.client.Minecraft.run(SourceFile:657)
at java.lang.Thread.run(Unknown Source)
--- END ERROR REPORT e1d62a9d ----------

显示错误代码如上，请问是什么原因

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