Bukkit

Im using the latest version of craft bukkit an minecraft same as the disease plugin but it won load for me any ideas?

[18:57:39 ERROR]: Could not load 'plugins\Disease-2.7.3.jar' in folder 'plugins'
org.bukkit.plugin.InvalidPluginException: java.lang.NoClassDefFoundError: net/md_5/bungee/api/chat/BaseComponent
at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:131) ~[craftbukkit-1.12.2.jar:git-Bukkit-31d3159]
at org.bukkit.plugin.SimplePluginManager.loadPlugin(SimplePluginManager.java:325) ~[craftbukkit-1.12.2.jar:git-Bukkit-31d3159]
at org.bukkit.plugin.SimplePluginManager.loadPlugins(SimplePluginManager.java:248) [craftbukkit-1.12.2.jar:git-Bukkit-31d3159]
at org.bukkit.craftbukkit.v1_12_R1.CraftServer.loadPlugins(CraftServer.java:306) [craftbukkit-1.12.2.jar:git-Bukkit-31d3159]
at net.minecraft.server.v1_12_R1.DedicatedServer.init(DedicatedServer.java:188) [craftbukkit-1.12.2.jar:git-Bukkit-31d3159]
at net.minecraft.server.v1_12_R1.MinecraftServer.run(MinecraftServer.java:522) [craftbukkit-1.12.2.jar:git-Bukkit-31d3159]
at java.lang.Thread.run(Unknown Source) [?:1.8.0_151]
Caused by: java.lang.NoClassDefFoundError: net/md_5/bungee/api/chat/BaseComponent
at com.hmmcrunchy.disease.Disease.<init>(Disease.java:120) ~[?:?]
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[?:1.8.0_151]
at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source) ~[?:1.8.0_151]
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source) ~[?:1.8.0_151]
at java.lang.reflect.Constructor.newInstance(Unknown Source) ~[?:1.8.0_151]
at java.lang.Class.newInstance(Unknown Source) ~[?:1.8.0_151]
at org.bukkit.plugin.java.PluginClassLoader.<init>(PluginClassLoader.java:52) ~[craftbukkit-1.12.2.jar:git-Bukkit-31d3159]
at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:127) ~[craftbukkit-1.12.2.jar:git-Bukkit-31d3159]
... 6 more
Caused by: java.lang.ClassNotFoundException: net.md_5.bungee.api.chat.BaseComponent
at java.net.URLClassLoader.findClass(Unknown Source) ~[?:1.8.0_151]
at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:77) ~[craftbukkit-1.12.2.jar:git-Bukkit-31d3159]
at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:62) ~[craftbukkit-1.12.2.jar:git-Bukkit-31d3159]
at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_151]
at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_151]
at com.hmmcrunchy.disease.Disease.<init>(Disease.java:120) ~[?:?]
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[?:1.8.0_151]
at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source) ~[?:1.8.0_151]
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source) ~[?:1.8.0_151]
at java.lang.reflect.Constructor.newInstance(Unknown Source) ~[?:1.8.0_151]
at java.lang.Class.newInstance(Unknown Source) ~[?:1.8.0_151]
at org.bukkit.plugin.java.PluginClassLoader.<init>(PluginClassLoader.java:52) ~[craftbukkit-1.12.2.jar:git-Bukkit-31d3159]
at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:127) ~[craftbukkit-1.12.2.jar:git-Bukkit-31d3159]
... 6 more

hey you using spigot?