papermail

[07:49:33 ERROR]: Could not pass event PlayerJoinEvent to PaperMail v1.0.1.4
org.bukkit.event.EventException
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.ja
va:320) ~[spigot.jar:git-Spigot-1.7.2-R0.3-122-gb58e277]
        at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.jav
a:62) ~[spigot.jar:git-Spigot-1.7.2-R0.3-122-gb58e277]
        at org.bukkit.plugin.TimedRegisteredListener.callEvent(TimedRegisteredLi
stener.java:30) ~[spigot.jar:git-Spigot-1.7.2-R0.3-122-gb58e277]
        at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.j
ava:487) [spigot.jar:git-Spigot-1.7.2-R0.3-122-gb58e277]
        at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.j
ava:472) [spigot.jar:git-Spigot-1.7.2-R0.3-122-gb58e277]
        at net.minecraft.server.v1_7_R1.PlayerList.c(PlayerList.java:245) [spigo
t.jar:git-Spigot-1.7.2-R0.3-122-gb58e277]
        at net.minecraft.server.v1_7_R1.PlayerList.a(PlayerList.java:135) [spigo
t.jar:git-Spigot-1.7.2-R0.3-122-gb58e277]
        at net.minecraft.server.v1_7_R1.LoginListener.c(LoginListener.java:87) [
spigot.jar:git-Spigot-1.7.2-R0.3-122-gb58e277]
        at net.minecraft.server.v1_7_R1.LoginListener.a(LoginListener.java:42) [
spigot.jar:git-Spigot-1.7.2-R0.3-122-gb58e277]
        at net.minecraft.server.v1_7_R1.NetworkManager.a(NetworkManager.java:150
) [spigot.jar:git-Spigot-1.7.2-R0.3-122-gb58e277]
        at net.minecraft.server.v1_7_R1.ServerConnection.c(ServerConnection.java
:77) [spigot.jar:git-Spigot-1.7.2-R0.3-122-gb58e277]
        at net.minecraft.server.v1_7_R1.MinecraftServer.u(MinecraftServer.java:7
00) [spigot.jar:git-Spigot-1.7.2-R0.3-122-gb58e277]
        at net.minecraft.server.v1_7_R1.DedicatedServer.u(DedicatedServer.java:2
73) [spigot.jar:git-Spigot-1.7.2-R0.3-122-gb58e277]
        at net.minecraft.server.v1_7_R1.MinecraftServer.t(MinecraftServer.java:5
62) [spigot.jar:git-Spigot-1.7.2-R0.3-122-gb58e277]
        at net.minecraft.server.v1_7_R1.MinecraftServer.run(MinecraftServer.java
:469) [spigot.jar:git-Spigot-1.7.2-R0.3-122-gb58e277]
        at net.minecraft.server.v1_7_R1.ThreadServerApplication.run(SourceFile:6
17) [spigot.jar:git-Spigot-1.7.2-R0.3-122-gb58e277]
Caused by: java.lang.NoClassDefFoundError: org/bukkit/craftbukkit/v1_7_R2/invent
ory/CraftItemStack
        at com.github.derwisch.paperMail.PaperMailListener.playerJoin(PaperMailL
istener.java:31) ~[?:?]
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.7.0
_10]
        at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.7.0
_10]
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1
.7.0_10]
        at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.7.0_10]
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.ja
va:318) ~[spigot.jar:git-Spigot-1.7.2-R0.3-122-gb58e277]
        ... 15 more
Caused by: java.lang.ClassNotFoundException: org.bukkit.craftbukkit.v1_7_R2.inve
ntory.CraftItemStack
        at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.
java:67) ~[spigot.jar:git-Spigot-1.7.2-R0.3-122-gb58e277]
        at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.
java:62) ~[spigot.jar:git-Spigot-1.7.2-R0.3-122-gb58e277]
        at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.7.0_10]
        at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.7.0_10]
        at com.github.derwisch.paperMail.PaperMailListener.playerJoin(PaperMailL
istener.java:31) ~[?:?]
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.7.0
_10]
        at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.7.0
_10]
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1
.7.0_10]
        at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.7.0_10]
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.ja
va:318) ~[spigot.jar:git-Spigot-1.7.2-R0.3-122-gb58e277]
        ... 15 more