java.lang.ClassNotFoundException

[kane50613]

[16:21:42 WARN]: java.lang.ClassNotFoundException: org.bukkit.craftbukkit.null.entity.CraftPlayer [16:21:42 WARN]: at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:91) [16:21:42 WARN]: at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:86) [16:21:42 WARN]: at java.lang.ClassLoader.loadClass(ClassLoader.java:424) [16:21:42 WARN]: at java.lang.ClassLoader.loadClass(ClassLoader.java:357) [16:21:42 WARN]: at java.lang.Class.forName0(Native Method) [16:21:42 WARN]: at java.lang.Class.forName(Class.java:264) [16:21:42 WARN]: at com.connorlinfoot.actionbarapi.ActionBarAPI.sendActionBar(ActionBarAPI.java:55) [16:21:42 WARN]: at com.Kanetw.KanePlugin.commands.Vanish$1.run(Vanish.java:123) [16:21:42 WARN]: at java.util.TimerThread.mainLoop(Timer.java:555) [16:21:42 WARN]: at java.util.TimerThread.run(Timer.java:505)
can you help me fix this? thanks :D

[Webbeh]

Describe your server setup

[TheFruxz]

I have the same issue too