I've included a part of the log file, starting with what you actually want to see. I'm assuming this is a direct issue between BookDisplay and Mantle (1.12-1.3.3.39), but if you can't reproduce then I'll go through all the addons I have installed and try to narrow it down.

java.lang.NoSuchMethodError: slimeknights.mantle.client.gui.book.GuiBook.(Lslimeknights/mantle/client/book/data/BookData;Lnet/minecraft/stats/StatisticsManager;Lnet/minecraft/item/ItemStack;)V
at astavie.bookdisplay.wrapper.mantle.GuiMantleBook.(GuiMantleBook.java:44) ~[GuiMantleBook.class:?]
at astavie.bookdisplay.wrapper.mantle.MantleWrapper.(MantleWrapper.java:20) ~[MantleWrapper.class:?]
at astavie.bookdisplay.BookDisplay.find(BookDisplay.java:47) ~[BookDisplay.class:?]
at astavie.bookdisplay.EventHandler.mainhand(EventHandler.java:30) ~[EventHandler.class:?]
at astavie.bookdisplay.EventHandler.onKey(EventHandler.java:60) ~[EventHandler.class:?]
at net.minecraftforge.fml.common.eventhandler.ASMEventHandler_1532_EventHandler_onKey_KeyInputEvent.invoke(.dynamic) ~[?:?]
at net.minecraftforge.fml.common.eventhandler.ASMEventHandler.invoke(ASMEventHandler.java:90) ~[ASMEventHandler.class:?]
at net.minecraftforge.fml.common.eventhandler.EventBus.post(EventBus.java:182) ~[EventBus.class:?]
at net.minecraftforge.fml.common.FMLCommonHandler.fireKeyInput(FMLCommonHandler.java:565) ~[FMLCommonHandler.class:?]
at net.minecraft.client.Minecraft.func_184118_az(Minecraft.java:2016) ~[bib.class:?]
at net.minecraft.client.Minecraft.func_71407_l(Minecraft.java:1807) ~[bib.class:?]
at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:1097) ~[bib.class:?]
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:397) [bib.class:?]
at net.minecraft.client.main.Main.main(SourceFile:123) [Main.class:?]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_191]
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_191]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_191]
at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_191]
at net.minecraft.launchwrapper.Launch.launch(Launch.java:135) [launchwrapper-1.12.jar:?]
at net.minecraft.launchwrapper.Launch.main(Launch.java:28) [launchwrapper-1.12.jar:?]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_191]
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_191]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_191]
at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_191]
at org.multimc.onesix.OneSixLauncher.launchWithMainClass(OneSixLauncher.java:196) [NewLaunch.jar:?]
at org.multimc.onesix.OneSixLauncher.launch(OneSixLauncher.java:231) [NewLaunch.jar:?]
at org.multimc.EntryPoint.listen(EntryPoint.java:143) [NewLaunch.jar:?]
at org.multimc.EntryPoint.main(EntryPoint.java:34) [NewLaunch.jar:?]