Dear everybody, 
hoping I'm not asking in the wrong channel, 
I'm facing the following issue and I'm unable to find more information around 
the web. 

This error is raised when I logout from Jenkins, and in general always when the 
login page is loaded: 

Mar 16, 2016 9:47:14 AM WARNING hudson.ExtensionFinder$Sezpoz scout

Failed to scout 
com.cloudbees.hudson.plugins.folder.properties.AuthorizationMatrixProperty$DescriptorImpl
java.lang.InstantiationException: java.lang.NoClassDefFoundError: 
com/cloudbees/hudson/plugins/folder/AbstractFolderPropertyDescriptor
        at net.java.sezpoz.IndexItem.element(IndexItem.java:146)
        at hudson.ExtensionFinder$Sezpoz.scout(ExtensionFinder.java:667)
        at 
hudson.ClassicPluginStrategy.findComponents(ClassicPluginStrategy.java:382)
        at hudson.ExtensionList.load(ExtensionList.java:349)
        at hudson.ExtensionList.ensureLoaded(ExtensionList.java:287)
        at hudson.ExtensionList.iterator(ExtensionList.java:156)
        at 
hudson.ClassicPluginStrategy.findComponents(ClassicPluginStrategy.java:381)
        at hudson.ExtensionList.load(ExtensionList.java:349)
        at hudson.ExtensionList.ensureLoaded(ExtensionList.java:287)
        at hudson.ExtensionList.get(ExtensionList.java:171)
        at 
hudson.PluginManager$PluginUpdateMonitor.getInstance(PluginManager.java:1261)
        at hudson.maven.PluginImpl.init(PluginImpl.java:58)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:606)
        at hudson.init.TaskMethodFinder.invoke(TaskMethodFinder.java:106)
        at hudson.init.TaskMethodFinder$TaskImpl.run(TaskMethodFinder.java:176)
        at org.jvnet.hudson.reactor.Reactor.runTask(Reactor.java:282)
        at jenkins.model.Jenkins$7.runTask(Jenkins.java:905)
        at org.jvnet.hudson.reactor.Reactor$2.run(Reactor.java:210)
        at org.jvnet.hudson.reactor.Reactor$Node.run(Reactor.java:117)
        at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
        at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.NoClassDefFoundError: 
com/cloudbees/hudson/plugins/folder/AbstractFolderPropertyDescriptor
        at java.lang.ClassLoader.defineClass1(Native Method)
        at java.lang.ClassLoader.defineClass(ClassLoader.java:800)
        at 
jenkins.util.AntClassLoader.defineClassFromData(AntClassLoader.java:1139)
        at 
hudson.ClassicPluginStrategy$AntClassLoader2.defineClassFromData(ClassicPluginStrategy.java:801)
        at 
jenkins.util.AntClassLoader.getClassFromStream(AntClassLoader.java:1310)
        at 
jenkins.util.AntClassLoader.findClassInComponents(AntClassLoader.java:1366)
        at jenkins.util.AntClassLoader.findClass(AntClassLoader.java:1326)
        at sun.reflect.GeneratedMethodAccessor25.invoke(Unknown Source)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:606)
        at 
jenkins.ClassLoaderReflectionToolkit.invoke(ClassLoaderReflectionToolkit.java:44)
        at 
jenkins.ClassLoaderReflectionToolkit._findClass(ClassLoaderReflectionToolkit.java:86)
        at 
hudson.PluginManager$UberClassLoader.findClass(PluginManager.java:1123)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
        at net.java.sezpoz.IndexItem.element(IndexItem.java:134)
        ... 24 more
Caused by: java.lang.ClassNotFoundException: 
com.cloudbees.hudson.plugins.folder.AbstractFolderPropertyDescriptor
        at 
jenkins.util.AntClassLoader.findClassInComponents(AntClassLoader.java:1376)
        at jenkins.util.AntClassLoader.findClass(AntClassLoader.java:1326)
        at jenkins.util.AntClassLoader.loadClass(AntClassLoader.java:1079)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
        ... 40 more


I've checked and the plugin *cloudbees* is not installed in my Jenkins 
instance, this is confusing me. 

I've updated all the installed plugin and then upgraded Jenkins to the lastest 
version: http://updates.jenkins-ci.org/download/war/*1.642.2*/jenkins.war

Currently I've no Idea on how to proceed

Many thanks for any hint

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