java.lang.NoClassDefFoundError: org/picocontainer/MutablePicoContainer

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    Expert tip

    The server rejects all jars that already belong to the server runtime (such as tomcat-**.jar, servlet**.jar). Consider substituting the CORS filter you're using for this one: https://goo.gl/ctQ7Fs

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    This is thrown when the Java Virtual Machine (JVM) tries to load a particular class and the specified class cannot be found in the classpath. Make sure poi-ooxml library jar is added to your project's build path and you are using the latest version.

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java.lang.NoClassDefFoundError: org/picocontainer/MutablePicoContainer	at java.lang.Class.getDeclaredConstructors0(Native Method)	at java.lang.Class.privateGetDeclaredConstructors(Unknown Source)	at java.lang.Class.getConstructor0(Unknown Source)	at java.lang.Class.newInstance0(Unknown Source)	at java.lang.Class.newInstance(Unknown Source)	at org.jivesoftware.openfire.container.PluginManager.loadPlugin(PluginManager.java:422)	at org.jivesoftware.openfire.container.PluginManager.access$1(PluginManager.java:282)	at org.jivesoftware.openfire.container.PluginManager$PluginMonitor.run(PluginManager.java:1072)	at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)	at java.util.concurrent.FutureTask$Sync.innerRunAndReset(Unknown Source)	at java.util.concurrent.FutureTask.runAndReset(Unknown Source)	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$101(Unknown Source)	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.runPeriodic(Unknown Source)	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(Unknown Source)	at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)	at java.lang.Thread.run(Unknown Source)Caused by: java.lang.ClassNotFoundException: org.picocontainer.MutablePicoContainer	at java.net.URLClassLoader$1.run(Unknown Source)	at java.security.AccessController.doPrivileged(Native Method)	at java.net.URLClassLoader.findClass(Unknown Source)	at java.lang.ClassLoader.loadClass(Unknown Source)	at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)	at java.lang.ClassLoader.loadClass(Unknown Source)	... 17 more