Crash report

[19:01:24] [Client thread/INFO] [STDOUT]: [net.minecraft.client.Minecraft:func_71377_b:349]: ---- Minecraft Crash Report ----
// Hi. I'm Minecraft, and I'm a crashaholic.

Time: 11/28/14 7:01 PM
Description: Rendering screen

java.lang.IllegalArgumentException: Could not get provider type for dimension 9, does not exist
    at net.minecraftforge.common.DimensionManager.getProviderType(DimensionManager.java:148)
    at com.xcompwiz.mystcraft.inventory.ContainerBook.isTargetWorldVisited(ContainerBook.java:116)
    at com.xcompwiz.mystcraft.client.gui.element.GuiElementBook.drawLinkPanel(GuiElementBook.java:179)
    at com.xcompwiz.mystcraft.client.gui.element.GuiElementBook.render(GuiElementBook.java:129)
    at com.xcompwiz.mystcraft.client.gui.GuiContainerElements.drawElementBackgrounds(GuiContainerElements.java:91)
    at com.xcompwiz.mystcraft.client.gui.GuiBook.func_146976_a(GuiBook.java:87)
    at net.minecraft.client.gui.inventory.GuiContainer.func_73863_a(GuiContainer.java:78)
    at net.minecraft.client.renderer.EntityRenderer.func_78480_b(EntityRenderer.java:1061)
    at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:990)
    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)
    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 org.multimc.onesix.OneSixLauncher.launchWithMainClass(OneSixLauncher.java:286)
    at org.multimc.onesix.OneSixLauncher.launch(OneSixLauncher.java:376)
    at org.multimc.EntryPoint.listen(EntryPoint.java:165)
    at org.multimc.EntryPoint.main(EntryPoint.java:54)