[WARNING] Error enabling plugin SLobby

java.lang.NoClassDefFoundError: org.bukkit.plugin.java.JavaPlugin

at java.lang.ClassLoader.defineClassImpl(Native Method)

at java.lang.ClassLoader.defineClassInternal(ClassLoader.java:391)

at java.lang.ClassLoader.defineClass(ClassLoader.java:360)

at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)

at java.net.URLClassLoader.defineClass(URLClassLoader.java:682)

at java.net.URLClassLoader.access$400(URLClassLoader.java:89)

at java.net.URLClassLoader$ClassFinder.run(URLClassLoader.java:1086)

at java.security.AccessController.doPrivileged(AccessController.java:739)

at java.net.URLClassLoader.findClass(URLClassLoader.java:589)

at java.lang.ClassLoader.loadClassHelper(ClassLoader.java:946)

at java.lang.ClassLoader.loadClass(ClassLoader.java:891)

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:874)

at net.md_5.bungee.api.plugin.PluginManager.enablePlugin(PluginManager.java:327)

at net.md_5.bungee.api.plugin.PluginManager.loadPlugins(PluginManager.java:235)

at net.md_5.bungee.BungeeCord.start(BungeeCord.java:266)

at net.md_5.bungee.BungeeCordLauncher.main(BungeeCordLauncher.java:62)

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:874)

... 19 more