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Hey, just wondering if anyone could help me. It's 1.7.10.

at net.minecraftforge.fluids.FluidRegistry.getDefaultFluidName(FluidRegistry.java:297)
at net.minecraftforge.fluids.FluidRegistry.writeDefaultFluidList(FluidRegistry.java:327)
at net.minecraftforge.common.ForgeModContainer.getDataForWriting(ForgeModContainer.java:315)
at cpw.mods.fml.common.FMLCommonHandler.handleWorldDataSave(FMLCommonHandler.java:375)
at net.minecraft.world.storage.SaveHandler.func_75761_a(SaveHandler.java:209)
at net.minecraft.client.Minecraft.func_71371_a(Minecraft.java:2081)
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:1640)
at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:973)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:898)
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)

Thanks.

Either outdated mods or outdated forge. Full crash report needed.