Bukkit

Summary:

DisguiseCraft version:
v5.1

CraftBukkit version:
CB-1.8_R1

Console Log (if any):
17:38:16 [SEVERE] Could not load 'plugins\DisguiseCraft.jar' in folder 'plugins'
17:38:16 org.bukkit.plugin.InvalidPluginException: java.lang.NoClassDefFoundError: net/minecraft/server/v1_8_R2/Packet
17:38:16     at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:133) ~[craftbukkit-1.8.jar:git-Bukkit-7019900]
17:38:16     at org.bukkit.plugin.SimplePluginManager.loadPlugin(SimplePluginManager.java:328) ~[craftbukkit-1.8.jar:git-Bukkit-7019900]
17:38:16     at org.bukkit.plugin.SimplePluginManager.loadPlugins(SimplePluginManager.java:251) [craftbukkit-1.8.jar:git-Bukkit-7019900]
17:38:16     at org.bukkit.craftbukkit.v1_8_R1.CraftServer.loadPlugins(CraftServer.java:288) [craftbukkit-1.8.jar:git-Bukkit-7019900]
17:38:16     at org.bukkit.craftbukkit.v1_8_R1.CraftServer.<init>(CraftServer.java:250) [craftbukkit-1.8.jar:git-Bukkit-7019900]
17:38:16     at net.minecraft.server.v1_8_R1.PlayerList.<init>(PlayerList.java:69) [craftbukkit-1.8.jar:git-Bukkit-7019900]
17:38:16     at net.minecraft.server.v1_8_R1.DedicatedPlayerList.<init>(SourceFile:14) [craftbukkit-1.8.jar:git-Bukkit-7019900]
17:38:16     at net.minecraft.server.v1_8_R1.DedicatedServer.init(DedicatedServer.java:133) [craftbukkit-1.8.jar:git-Bukkit-7019900]
17:38:16     at net.minecraft.server.v1_8_R1.MinecraftServer.run(MinecraftServer.java:484) [craftbukkit-1.8.jar:git-Bukkit-7019900]
17:38:16     at java.lang.Thread.run(Unknown Source) [?:1.7.0_80]
17:38:16 Caused by: java.lang.NoClassDefFoundError: net/minecraft/server/v1_8_R2/Packet
17:38:16     at java.lang.Class.forName0(Native Method) ~[?:1.7.0_80]
17:38:16     at java.lang.Class.forName(Unknown Source) ~[?:1.7.0_80]
17:38:16     at org.bukkit.plugin.java.PluginClassLoader.<init>(PluginClassLoader.java:40) ~[craftbukkit-1.8.jar:git-Bukkit-7019900]
17:38:16     at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:129) ~[craftbukkit-1.8.jar:git-Bukkit-7019900]
17:38:16     ... 9 more
17:38:16 Caused by: java.lang.ClassNotFoundException: net.minecraft.server.v1_8_R2.Packet
17:38:16     at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:67) ~[craftbukkit-1.8.jar:git-Bukkit-7019900]
17:38:16     at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:62) ~[craftbukkit-1.8.jar:git-Bukkit-7019900]
17:38:16     at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.7.0_80]
17:38:16     at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.7.0_80]
17:38:16     at java.lang.Class.forName0(Native Method) ~[?:1.7.0_80]
17:38:16     at java.lang.Class.forName(Unknown Source) ~[?:1.7.0_80]
17:38:16     at org.bukkit.plugin.java.PluginClassLoader.<init>(PluginClassLoader.java:40) ~[craftbukkit-1.8.jar:git-Bukkit-7019900]
17:38:16     at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:129) ~[craftbukkit-1.8.jar:git-Bukkit-7019900]
17:38:16     ... 9 more

Steps to reproduce:
1. Just load my server and bam, the plugin won't load
2. I am using Java 7, could it be because it is compiled with Java 8 and won't work with Java 7 ?

Your using spigot 1.8.0 and trying to use a build for spigot 1.8.3.

http://build.yu8.me:8080/job/DisguiseCraft/67/

try that and let me know if that works for ya.