[WARNING] Error enabling plugin AdvancedPortals
java.lang.NoClassDefFoundError: org/bukkit/plugin/java/JavaPlugin
    at java.lang.ClassLoader.defineClass1(Native Method)
    at java.lang.ClassLoader.defineClass(ClassLoader.java:763)
    at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
    at java.net.URLClassLoader.defineClass(URLClassLoader.java:468)
    at java.net.URLClassLoader.access$100(URLClassLoader.java:74)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:369)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:363)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:362)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
    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(ClassLoader.java:357)
    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:266)
    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(ClassLoader.java:357)
    ... 18 more