Repairing the pearl is broken

[msglm]

when repairing the pearl with obsidian instead of getting a peal, I get an enchanted stone button. It also spews this error into the server's log.

Could not pass event PrepareItemCraftEvent to ExilePearl v1.1.0
org.bukkit.event.EventException: null
at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:298) ~[craftbukkit-1.12.2.jar:git-Bukkit-2b93d83]
at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[craftbukkit-1.12.2.jar:git-Bukkit-2b93d83]
at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:499) [craftbukkit-1.12.2.jar:git-Bukkit-2b93d83]
at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:484) [craftbukkit-1.12.2.jar:git-Bukkit-2b93d83]
at org.bukkit.craftbukkit.v1_12_R1.event.CraftEventFactory.callPreCraftEvent(CraftEventFactory.java:781) [craftbukkit-1.12.2.jar:git-Bukkit-2b93d83]
at net.minecraft.server.v1_12_R1.Container.a(Container.java:639) [craftbukkit-1.12.2.jar:git-Bukkit-2b93d83]
at net.minecraft.server.v1_12_R1.ContainerWorkbench.a(ContainerWorkbench.java:54) [craftbukkit-1.12.2.jar:git-Bukkit-2b93d83]
at net.minecraft.server.v1_12_R1.InventoryCrafting.setItem(InventoryCrafting.java:130) [craftbukkit-1.12.2.jar:git-Bukkit-2b93d83]
at net.minecraft.server.v1_12_R1.Slot.set(SourceFile:79) [craftbukkit-1.12.2.jar:git-Bukkit-2b93d83]
at net.minecraft.server.v1_12_R1.Container.a(Container.java:272) [craftbukkit-1.12.2.jar:git-Bukkit-2b93d83]
at net.minecraft.server.v1_12_R1.PlayerConnection.a(PlayerConnection.java:1828) [craftbukkit-1.12.2.jar:git-Bukkit-2b93d83]
at net.minecraft.server.v1_12_R1.PacketPlayInWindowClick.a(SourceFile:33) [craftbukkit-1.12.2.jar:git-Bukkit-2b93d83]
at net.minecraft.server.v1_12_R1.PacketPlayInWindowClick.a(SourceFile:10) [craftbukkit-1.12.2.jar:git-Bukkit-2b93d83]
at net.minecraft.server.v1_12_R1.PlayerConnectionUtils$1.run(SourceFile:13) [craftbukkit-1.12.2.jar:git-Bukkit-2b93d83]
at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) [?:1.8.0_181]
at java.util.concurrent.FutureTask.run(Unknown Source) [?:1.8.0_181]
at net.minecraft.server.v1_12_R1.SystemUtils.a(SourceFile:46) [craftbukkit-1.12.2.jar:git-Bukkit-2b93d83]
at net.minecraft.server.v1_12_R1.MinecraftServer.D(MinecraftServer.java:696) [craftbukkit-1.12.2.jar:git-Bukkit-2b93d83]
at net.minecraft.server.v1_12_R1.DedicatedServer.D(DedicatedServer.java:371) [craftbukkit-1.12.2.jar:git-Bukkit-2b93d83]
at net.minecraft.server.v1_12_R1.MinecraftServer.C(MinecraftServer.java:651) [craftbukkit-1.12.2.jar:git-Bukkit-2b93d83]
at net.minecraft.server.v1_12_R1.MinecraftServer.run(MinecraftServer.java:555) [craftbukkit-1.12.2.jar:git-Bukkit-2b93d83]
at java.lang.Thread.run(Unknown Source) [?:1.8.0_181]
Caused by: java.lang.NoClassDefFoundError: org/bukkit/craftbukkit/v1_13_R2/inventory/CraftItemStack
at vg.civcraft.mc.civmodcore.itemHandling.ItemMap.createMapConformCopy(ItemMap.java:586) ~[?:?]
at vg.civcraft.mc.civmodcore.itemHandling.ItemMap.addItemStack(ItemMap.java:93) ~[?:?]
at vg.civcraft.mc.civmodcore.itemHandling.ItemMap.update(ItemMap.java:186) ~[?:?]
at vg.civcraft.mc.civmodcore.itemHandling.ItemMap.(ItemMap.java:56) ~[?:?]
at com.devotedmc.ExilePearl.listener.PlayerListener.onPrepareCraftPearl(PlayerListener.java:875) ~[?:?]
at sun.reflect.GeneratedMethodAccessor7.invoke(Unknown Source) ~[?:?]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_181]
at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_181]
at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:296) ~[craftbukkit-1.12.2.jar:git-Bukkit-2b93d83]
... 21 more
Caused by: java.lang.ClassNotFoundException: org.bukkit.craftbukkit.v1_13_R2.inventory.CraftItemStack
at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:81) ~[craftbukkit-1.12.2.jar:git-Bukkit-2b93d83]
at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:76) ~[craftbukkit-1.12.2.jar:git-Bukkit-2b93d83]
at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_181]
at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_181]
at vg.civcraft.mc.civmodcore.itemHandling.ItemMap.createMapConformCopy(ItemMap.java:586) ~[?:?]
at vg.civcraft.mc.civmodcore.itemHandling.ItemMap.addItemStack(ItemMap.java:93) ~[?:?]
at vg.civcraft.mc.civmodcore.itemHandling.ItemMap.update(ItemMap.java:186) ~[?:?]
at vg.civcraft.mc.civmodcore.itemHandling.ItemMap.(ItemMap.java:56) ~[?:?]
at com.devotedmc.ExilePearl.listener.PlayerListener.onPrepareCraftPearl(PlayerListener.java:875) ~[?:?]
at sun.reflect.GeneratedMethodAccessor7.invoke(Unknown Source) ~[?:?]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_181]
at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_181]
at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:296) ~[craftbukkit-1.12.2.jar:git-Bukkit-2b93d83]
... 21 more