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Need help playing my own custom modpack i get this crash report everytime i go into a new world

---- Minecraft Crash Report ----
// I blame Dinnerbone.

Time: 4/3/15 12:42 PM
Description: Starting integrated server

com.google.gson.JsonSyntaxException: com.google.gson.stream.MalformedJsonException: Unterminated object at line 1 column 16388
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.<init>(SourceFile:42)
at net.minecraft.server.MinecraftServer.<init>(MinecraftServer.java:142)
at net.minecraft.server.integrated.IntegratedServer.<init>(IntegratedServer.java:45)
at net.minecraft.client.Minecraft.func_71371_a(Minecraft.java:2079)
at cpw.mods.fml.client.FMLClientHandler.tryLoadExistingWorld(FMLClientHandler.java:669)
at net.minecraft.client.gui.GuiSelectWorld.func_146615_e(GuiSelectWorld.java:183)
at net.minecraft.client.gui.GuiSelectWorld$List.func_148144_a(GuiSelectWorld.java:257)
at net.minecraft.client.gui.GuiSlot.func_148128_a(GuiSlot.java:209)
at net.minecraft.client.gui.GuiSelectWorld.func_73863_a(GuiSelectWorld.java:216)
at net.minecraft.client.renderer.EntityRenderer.func_78480_b(EntityRenderer.java:1061)
at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:989)
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(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:483)
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 16388
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.<init>(SourceFile:42)
at net.minecraft.server.MinecraftServer.<init>(MinecraftServer.java:142)
at net.minecraft.server.integrated.IntegratedServer.<init>(IntegratedServer.java:45)

-- Starting integrated server --
Details:
Level ID: Test
Level Name: Test
Stacktrace:
at net.minecraft.client.Minecraft.func_71371_a(Minecraft.java:2079)
at cpw.mods.fml.client.FMLClientHandler.tryLoadExistingWorld(FMLClientHandler.java:669)
at net.minecraft.client.gui.GuiSelectWorld.func_146615_e(GuiSelectWorld.java:183)
at net.minecraft.client.gui.GuiSelectWorld$List.func_148144_a(GuiSelectWorld.java:257)
at net.minecraft.client.gui.GuiSlot.func_148128_a(GuiSlot.java:209)
at net.minecraft.client.gui.GuiSelectWorld.func_73863_a(GuiSelectWorld.java:216)

-- Screen render details --
Details:
Screen name: net.minecraft.client.gui.GuiMainMenu
Mouse location: Scaled: (254, 214). Absolute: (508, 594)
Screen size: Scaled: (640, 512). Absolute: (1280, 1024). Scale factor of 2
Stacktrace:
at net.minecraft.client.renderer.EntityRenderer.func_78480_b(EntityRenderer.java:1061)
at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:989)
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(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:483)
at net.minecraft.launchwrapper.Launch.launch(Launch.java:135)
at net.minecraft.launchwrapper.Launch.main(Launch.java:28)

Please post under http://www.minecraftforum.net/forums/support/modded-client-support. People will help you there, not here.