Server Plugin Error

I'm trying to help a friend by setting up their plugins but I'm getting this error and I've come across no articles or references that help to figure out why this error is occurring. If someone is able to assist with this error for me, that's be helpful!

On a side note, no transaction messages go into chat. E.G. I had someone buy something from my chestshop and it didn't tell me he did. No events go through chat to notify of the transaction event.

Code:

[ERROR] Could not pass event TransactionEvent to ChestShop v3.9.2 (build 86)
org.bukkit.event.EventException
at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:302) ~[craftbukkit-1.8.8.jar:git-Bukkit-e1ebe52]
at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[craftbukkit-1.8.8.jar:git-Bukkit-e1ebe52]
at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:501) [craftbukkit-1.8.8.jar:git-Bukkit-e1ebe52]
at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:486) [craftbukkit-1.8.8.jar:git-Bukkit-e1ebe52]
at com.Acrobot.ChestShop.Listeners.Player.PlayerInteract.onInteract(PlayerInteract.java:132) [ChestShop.jar:?]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_192]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_192]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_192]
at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_192]
at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:300) [craftbukkit-1.8.8.jar:git-Bukkit-e1ebe52]
at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) [craftbukkit-1.8.8.jar:git-Bukkit-e1ebe52]
at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:501) [craftbukkit-1.8.8.jar:git-Bukkit-e1ebe52]
at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:486) [craftbukkit-1.8.8.jar:git-Bukkit-e1ebe52]
at org.bukkit.craftbukkit.v1_8_R3.event.CraftEventFactory.callPlayerInteractEvent(CraftEventFactory.java:211) [craftbukkit-1.8.8.jar:git-Bukkit-e1ebe52]
at org.bukkit.craftbukkit.v1_8_R3.event.CraftEventFactory.callPlayerInteractEvent(CraftEventFactory.java:178) [craftbukkit-1.8.8.jar:git-Bukkit-e1ebe52]
at net.minecraft.server.v1_8_R3.PlayerInteractManager.a(PlayerInteractManager.java:107) [craftbukkit-1.8.8.jar:git-Bukkit-e1ebe52]
at net.minecraft.server.v1_8_R3.PlayerConnection.a(PlayerConnection.java:608) [craftbukkit-1.8.8.jar:git-Bukkit-e1ebe52]
at net.minecraft.server.v1_8_R3.PacketPlayInBlockDig.a(SourceFile:40) [craftbukkit-1.8.8.jar:git-Bukkit-e1ebe52]
at net.minecraft.server.v1_8_R3.PacketPlayInBlockDig.a(SourceFile:10) [craftbukkit-1.8.8.jar:git-Bukkit-e1ebe52]
at net.minecraft.server.v1_8_R3.PlayerConnectionUtils$1.run(SourceFile:13) [craftbukkit-1.8.8.jar:git-Bukkit-e1ebe52]
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [?:1.8.0_192]
at java.util.concurrent.FutureTask.run(FutureTask.java:266) [?:1.8.0_192]
at net.minecraft.server.v1_8_R3.SystemUtils.a(SourceFile:44) [craftbukkit-1.8.8.jar:git-Bukkit-e1ebe52]
at net.minecraft.server.v1_8_R3.MinecraftServer.B(MinecraftServer.java:673) [craftbukkit-1.8.8.jar:git-Bukkit-e1ebe52]
at net.minecraft.server.v1_8_R3.DedicatedServer.B(DedicatedServer.java:335) [craftbukkit-1.8.8.jar:git-Bukkit-e1ebe52]
at net.minecraft.server.v1_8_R3.MinecraftServer.A(MinecraftServer.java:629) [craftbukkit-1.8.8.jar:git-Bukkit-e1ebe52]
at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:537) [craftbukkit-1.8.8.jar:git-Bukkit-e1ebe52]
at java.lang.Thread.run(Thread.java:813) [?:1.8.0_192]
Caused by: java.lang.NoClassDefFoundError: org/bukkit/material/Wood
at com.Acrobot.Breeze.Utils.MaterialUtil$DataValue.name(MaterialUtil.java:458) ~[?:?]
at com.Acrobot.Breeze.Utils.MaterialUtil.getName(MaterialUtil.java:174) ~[?:?]
at com.Acrobot.Breeze.Utils.MaterialUtil.getName(MaterialUtil.java:128) ~[?:?]
at com.Acrobot.ChestShop.Listeners.PostTransaction.TransactionMessageSender.parseItemInformation(TransactionMessageSender.java:90) ~[?:?]
at com.Acrobot.ChestShop.Listeners.PostTransaction.TransactionMessageSender.sendMessage(TransactionMessageSender.java:81) ~[?:?]
at com.Acrobot.ChestShop.Listeners.PostTransaction.TransactionMessageSender.sendSellMessage(TransactionMessageSender.java:59) ~[?:?]
at com.Acrobot.ChestShop.Listeners.PostTransaction.TransactionMessageSender.onTransaction(TransactionMessageSender.java:32) ~[?:?]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_192]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_192]
at sun.reflect.delegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_192]
at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_192]
at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:300) ~[craftbukkit-1.8.8.jar:git-Bukkit-e1ebe52]
... 27 more

 

Alright, will try it.

It works, thank you for that!

EDIT by Moderator: merged posts, please use the edit button instead of double posting.