BiblioCraft Error

bibliocraft.txt

[04:31:58] [Server thread/FATAL]: [MinecraftServer]: Error executing task
java.util.concurrent.ExecutionException: java.lang.AbstractMethodError: Method jds/bibliocraft/tileentities/TileEntityClipboard.getStackInSlot(I)Lnet/minecraft/item/ItemStack; is abstract
	at java.util.concurrent.FutureTask.report(FutureTask.java:122) ~[?:1.8.0_212]
	at java.util.concurrent.FutureTask.get(FutureTask.java:192) ~[?:1.8.0_212]
	at net.minecraft.util.Util.func_181617_a(SourceFile:47) [h.class:?]
	at org.spongepowered.common.SpongeImplHooks.onUtilRunTask(SpongeImplHooks.java:325) [SpongeImplHooks.class:1.12.2-2838-7.3.1-RC4082]
	at net.minecraft.server.MinecraftServer.redirect$zjl000$onRun(MinecraftServer.java:4682) [MinecraftServer.class:?]
	at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:723) [MinecraftServer.class:?]
	at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:397) [nz.class:?]
	at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:668) [MinecraftServer.class:?]
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:526) [MinecraftServer.class:?]
	at java.lang.Thread.run(Thread.java:748) [?:1.8.0_212]
Caused by: java.lang.AbstractMethodError: Method jds/bibliocraft/tileentities/TileEntityClipboard.getStackInSlot(I)Lnet/minecraft/item/ItemStack; is abstract
	at jds.bibliocraft.tileentities.TileEntityClipboard.getStackInSlot(TileEntityClipboard.java) ~[TileEntityClipboard.class:?]
	at com.rwtema.extrautils2.crafting.Radar$PacketPing.lambda$doStuffServer$1(Radar.java:185) ~[Radar$PacketPing.class:?]
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) ~[?:1.8.0_212]
	at java.util.concurrent.FutureTask.run(FutureTask.java:266) ~[?:1.8.0_212]
	at net.minecraft.util.Util.func_181617_a(SourceFile:46) ~[h.class:?]
	... 7 more
[04:31:58] [Server thread/FATAL]: [MinecraftServer]: Error executing task
java.util.concurrent.ExecutionException: java.lang.AbstractMethodError: Method jds/bibliocraft/tileentities/TileEntityClipboard.getStackInSlot(I)Lnet/minecraft/item/ItemStack; is abstract
	at java.util.concurrent.FutureTask.report(FutureTask.java:122) ~[?:1.8.0_212]
	at java.util.concurrent.FutureTask.get(FutureTask.java:192) ~[?:1.8.0_212]
	at net.minecraft.util.Util.func_181617_a(SourceFile:47) [h.class:?]
	at org.spongepowered.common.SpongeImplHooks.onUtilRunTask(SpongeImplHooks.java:325) [SpongeImplHooks.class:1.12.2-2838-7.3.1-RC4082]
	at net.minecraft.server.MinecraftServer.redirect$zjl000$onRun(MinecraftServer.java:4682) [MinecraftServer.class:?]
	at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:723) [MinecraftServer.class:?]
	at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:397) [nz.class:?]
	at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:668) [MinecraftServer.class:?]
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:526) [MinecraftServer.class:?]
	at java.lang.Thread.run(Thread.java:748) [?:1.8.0_212]
Caused by: java.lang.AbstractMethodError: Method jds/bibliocraft/tileentities/TileEntityClipboard.getStackInSlot(I)Lnet/minecraft/item/ItemStack; is abstract
	at jds.bibliocraft.tileentities.TileEntityClipboard.getStackInSlot(TileEntityClipboard.java) ~[TileEntityClipboard.class:?]
	at com.rwtema.extrautils2.crafting.Radar$PacketPing.lambda$doStuffServer$1(Radar.java:185) ~[Radar$PacketPing.class:?]
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) ~[?:1.8.0_212]
	at java.util.concurrent.FutureTask.run(FutureTask.java:266) ~[?:1.8.0_212]
	at net.minecraft.util.Util.func_181617_a(SourceFile:46) ~[h.class:?]
	... 7 more