Why I fail upload plugin, but in notif it's success?

Hi fiends, I got trouble when uploading my custom plugin. I was successfully upload my custom plugin, but my problem is I can’t get my plugin show in my openfire admin panel also not show menu in there? I check in my logs openfire admin panel it show error, I’m using openfire 4.1.3 and here is my error

"

2017.05.27 04:43:12 org.jivesoftware.openfire.container.PluginManager - An exception occurred while$

java.lang.ClassNotFoundException: com.java.customplugin.interest

at java.net.URLClassLoader$1.run(URLClassLoader.java:359)

at java.net.URLClassLoader$1.run(URLClassLoader.java:348)

at java.security.AccessController.doPrivileged(Native Method)

at java.net.URLClassLoader.findClass(URLClassLoader.java:347)

at java.lang.ClassLoader.loadClass(ClassLoader.java:425)

at java.lang.ClassLoader.loadClass(ClassLoader.java:358)

at org.jivesoftware.openfire.container.PluginManager.loadPlugin(PluginManager.java :354)

at org.jivesoftware.openfire.container.PluginMonitor$MonitorTask$4.call(PluginMoni tor.java:$

at org.jivesoftware.openfire.container.PluginMonitor$MonitorTask$4.call(PluginMoni tor.java:$

at java.util.concurrent.FutureTask.run(FutureTask.java:262)

at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)

at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)

at java.lang.Thread.run(Thread.java:745)

". Thanks for your help before.

Update Error Log

Plugin loading has greatly improved for the upcoming Openfire 4.2 release. Are you in a position to test with it?