TConstruct Crash #2

---- Minecraft Crash Report ----
// Oh - I know what I did wrong!

Time: 2/23/14 2:50 PM
Description: Rendering screen

java.lang.NullPointerException: Rendering screen
	at tconstruct.client.pages.ModifierPage.renderContentLayer(ModifierPage.java:49)
	at mantle.client.gui.GuiManual.func_73863_a(GuiManual.java:189)
	at net.minecraft.client.renderer.EntityRenderer.func_78480_b(EntityRenderer.java:1109)
	at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:984)
	at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:873)
	at net.minecraft.client.main.Main.main(SourceFile:103)
	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:134)
	at net.minecraft.launchwrapper.Launch.main(Launch.java:28)