can't open the manual any more

[shaquile737]

Unreported exception thrown!
java.lang.NullPointerException
at net.minecraftforge.fml.client.FMLClientHandler.getCurrentLanguage(FMLClientHandler.java:667)
at net.minecraftforge.fml.common.FMLCommonHandler.getCurrentLanguage(FMLCommonHandler.java:546)
at li.cil.oc.client.Manual$.contentFor(Manual.scala:90)
at li.cil.oc.api.Manual.contentFor(Manual.java:142)
at li.cil.oc.client.gui.Manual.refreshPage(Manual.scala:58)
at li.cil.oc.client.gui.Manual.func_73866_w_(Manual.scala:100)
at net.minecraft.client.gui.GuiScreen.func_146280_a(GuiScreen.java:478)
at net.minecraft.client.Minecraft.func_147108_a(Minecraft.java:1018)
at net.minecraftforge.fml.client.FMLClientHandler.showGuiScreen(FMLClientHandler.java:501)
at net.minecraftforge.fml.common.FMLCommonHandler.showGuiScreen(FMLCommonHandler.java:322)
at net.minecraftforge.fml.common.network.internal.FMLNetworkHandler.openGui(FMLNetworkHandler.java:112)
at net.minecraft.entity.player.EntityPlayer.openGui(EntityPlayer.java:2550)
at li.cil.oc.client.Manual$.openFor(Manual.scala:112)
at li.cil.oc.api.Manual.openFor(Manual.java:158)
at li.cil.oc.common.item.Manual.onItemRightClick(Manual.scala:31)
at li.cil.oc.common.item.Delegator.func_77659_a(Delegator.scala:152)
at net.minecraft.item.ItemStack.func_77957_a(ItemStack.java:217)
at net.minecraft.client.multiplayer.PlayerControllerMP.func_187101_a(PlayerControllerMP.java:511)
at net.optifine.override.PlayerControllerOF.func_187101_a(PlayerControllerOF.java:80)
at net.minecraft.client.Minecraft.func_147121_ag(Minecraft.java:1597)
at net.minecraft.client.Minecraft.func_184117_aA(Minecraft.java:2254)
at net.minecraft.client.Minecraft.func_184118_az(Minecraft.java:2020)
at net.minecraft.client.Minecraft.func_71407_l(Minecraft.java:1808)
at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:1098)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:398)
at net.minecraft.client.main.Main.main(SourceFile:123)
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:497)
at net.minecraft.launchwrapper.Launch.launch(Launch.java:135)
at net.minecraft.launchwrapper.Launch.main(Launch.java:28)