Hướng dẫn Cài BungeePortals và BungeePerms

Mik ko biết cách cài mấy cái này. Khi mik cho vào file .../BungeeCord/plugins. Thì nó error:
07:41:12 [WARNING] Error enabling plugin BungeePortals
java.lang.NoClassDefFoundError: org/bukkit/plugin/java/JavaPlugin
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(Unknown Source)
at java.security.SecureClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.access$100(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at net.md_5.bungee.api.plugin.PluginClassloader.loadClass0(PluginClassloader.java:34)
at net.md_5.bungee.api.plugin.PluginClassloader.loadClass(PluginClassloader.java:27)
at java.lang.ClassLoader.loadClass(Unknown Source)
at net.md_5.bungee.api.plugin.PluginManager.enablePlugin(PluginManager.java:304)
at net.md_5.bungee.api.plugin.PluginManager.loadPlugins(PluginManager.java:212)
at net.md_5.bungee.BungeeCord.start(BungeeCord.java:267)
at net.md_5.bungee.BungeeCordLauncher.main(BungeeCordLauncher.java:56)
at net.md_5.bungee.Bootstrap.main(Bootstrap.java:15)
Caused by: java.lang.ClassNotFoundException: org.bukkit.plugin.java.JavaPlugin
at net.md_5.bungee.api.plugin.PluginClassloader.loadClass0(PluginClassloader.java:53)
at net.md_5.bungee.api.plugin.PluginClassloader.loadClass(PluginClassloader.java:27)
at java.lang.ClassLoader.loadClass(Unknown Source)
... 18 more
Giúp Mik!!!

prefix phải là Hỏi chứ ông