Games : CRASH! someone please help!

my minecraft keeps crashing when I login (it launches but crashes when I enter a singleplayer world) and my minecraft is premium I looked for answers but I cant find anything about this kind of crash

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

Time: 06.02.2015 09:47 Description: Starting integrated server

com.google.gson.JsonSyntaxException: com.google.gson.stream.MalformedJsonException: Unterminated object at line 1 column 8194 at com.google.gson.internal.Streams.parse(Streams.java:56) at com.google.gson.TreeTypeAdapter.read(TreeTypeAdapter.java:54) at com.google.gson.internal.bind.TypeAdapterRuntimeTypeWrapper.read(TypeAdapterRuntimeTypeWrapper.java:40) at com.google.gson.internal.bind.CollectionTypeAdapterFactory$Adapter.read(CollectionTypeAdapterFactory.java:81) at com.google.gson.internal.bind.CollectionTypeAdapterFactory$Adapter.read(CollectionTypeAdapterFactory.java:60) at com.google.gson.Gson.fromJson(Gson.java:803) at com.google.gson.Gson.fromJson(Gson.java:768) at net.minecraft.server.management.PlayerProfileCache.func_152657_b(SourceFile:156) at net.minecraft.server.management.PlayerProfileCache.(SourceFile:42) at net.minecraft.server.MinecraftServer.(MinecraftServer.java:142) at net.minecraft.server.integrated.IntegratedServer.(IntegratedServer.java:45) at net.minecraft.client.Minecraft.func_71371_a(Minecraft.java:2080) at net.minecraft.client.gui.GuiCreateWorld.func_146284_a(GuiCreateWorld.java:230) at net.minecraft.client.gui.GuiScreen.func_73864_a(GuiScreen.java:225) at net.minecraft.client.gui.GuiCreateWorld.func_73864_a(GuiCreateWorld.java:377) at net.minecraft.client.gui.GuiScreen.func_146274_d(GuiScreen.java:296) at net.minecraft.client.gui.GuiScreen.func_146269_k(GuiScreen.java:268) at net.minecraft.client.Minecraft.func_71407_l(Minecraft.java:1629) at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:962) at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:887) at net.minecraft.client.main.Main.main(SourceFile:148) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at net.minecraft.launchwrapper.Launch.launch(Launch.java:135) at net.minecraft.launchwrapper.Launch.main(Launch.java:28) Caused by: com.google.gson.stream.MalformedJsonException: Unterminated object at line 1 column 8194 at com.google.gson.stream.JsonReader.syntaxError(JsonReader.java:1505) at com.google.gson.stream.JsonReader.doPeek(JsonReader.java:480) at com.google.gson.stream.JsonReader.hasNext(JsonReader.java:403) at com.google.gson.internal.bind.TypeAdapters$25.read(TypeAdapters.java:666) at com.google.gson.internal.bind.TypeAdapters$25.read(TypeAdapters.java:642) at com.google.gson.internal.Streams.parse(Streams.java:44) ... 26 more

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

-- Head -- Stacktrace: at com.google.gson.internal.Streams.parse(Streams.java:56) at com.google.gson.TreeTypeAdapter.read(TreeTypeAdapter.java:54) at com.google.gson.internal.bind.TypeAdapterRuntimeTypeWrapper.read(TypeAdapterRuntimeTypeWrapper.java:40) at com.google.gson.internal.bind.CollectionTypeAdapterFactory$Adapter.read(CollectionTypeAdapterFactory.java:81) at com.google.gson.internal.bind.CollectionTypeAdapterFactory$Adapter.read(CollectionTypeAdapterFactory.java:60) at com.google.gson.Gson.fromJson(Gson.java:803) at com.google.gson.Gson.fromJson(Gson.java:768) at net.minecraft.server.management.PlayerProfileCache.func_152657_b(SourceFile:156) at net.minecraft.server.management.PlayerProfileCache.(SourceFile:42) at net.minecraft.server.MinecraftServer.(MinecraftServer.java:142) at net.minecraft.server.integrated.IntegratedServer.(IntegratedServer.java:45)

-- Starting integrated server -- Details: Level ID: New World-------------------- Level Name: New World Stacktrace: at net.minecraft.client.Minecraft.func_71371_a(Minecraft.java:2080) at net.minecraft.client.gui.GuiCreateWorld.func_146284_a(GuiCreateWorld.java:230) at net.minecraft.client.gui.GuiScreen.func_73864_a(GuiScreen.java:225) at net.minecraft.client.gui.GuiCreateWorld.func_73864_a(GuiCreateWorld.java:377) at net.minecraft.client.gui.GuiScreen.func_146274_d(GuiScreen.java:296) at net.minecraft.client.gui.GuiScreen.func_146269_k(GuiScreen.java:268)

-- Affected screen -- Details: Screen name: net.minecraft.client.gui.GuiMainMenu Stacktrace: at net.minecraft.client.Minecraft.func_71407_l(Minecraft.java:1629) at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:962) at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:887) at net.minecraft.client.main.Main.main(SourceFile:148) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at net.minecraft.launchwrapper.Launch.launch(Launch.java:135) at net.minecraft.launchwrapper.Launch.main(Launch.java:28)

-- System Details -- Details: Minecraft Version: 1.7.10 Operating System: Windows 8 (amd64) version 6.2 Java Version: 1.8.0_31, Oracle Corporation Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation Memory: 180466328 bytes (172 MB) / 266108928 bytes (253 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 IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0 FML: MCP v9.05 FML v7.10.85.1240 Minecraft Forge 10.13.2.1240 3 mods loaded, 3 mods active mcp{9.05} [Minecraft Coder Pack] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available FML{7.10.85.1240} [Forge Mod Loader] (forge-1.7.10-10.13.2.1240.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available Forge{10.13.2.1240} [Minecraft Forge] (forge-1.7.10-10.13.2.1240.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available Launched Version: 1.7.10-Forge10.13.2.1240 LWJGL: 2.9.1 OpenGL: Intel(R) HD Graphics 4000 GL version 4.0.0 - Build 9.17.10.2857, Intel GL Caps: Using GL 1.3 multitexturing. Using framebuffer objects because OpenGL 3.0 is supported and separate blending is supported. Anisotropic filtering is supported and maximum anisotropy is 16. Shaders are available because OpenGL 2.1 is supported.

Is Modded: Definitely; Client brand changed to 'fml,forge'
Type: Client (map_client.txt)
Resource Packs: []
Current Language: English (US)
Profiler Position: N/A (disabled)
Vec3 Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
Anisotropic Filtering: Off (1)