java.lang.ClassNotFoundException: examples.colorpicker.ColorPreview
        at java.net.URLClassLoader$1.run(URLClassLoader.java:199)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(URLClassLoader.java:187)
        at org.openide.execution.NbClassLoader.findClass(NbClassLoader.java:152)
        at org.netbeans.api.java.classpath.ClassLoaderSupport.findClass(ClassLoaderSupport.java:109)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:289)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:235)
        at org.netbeans.modules.form.PersistenceObjectRegistry.loadClass(PersistenceObjectRegistry.java:64)
        at org.netbeans.modules.form.GandalfPersistenceManager.restoreComponent(GandalfPersistenceManager.java:437)
        at org.netbeans.modules.form.GandalfPersistenceManager.loadComponent(GandalfPersistenceManager.java:635)
        at org.netbeans.modules.form.GandalfPersistenceManager.restoreComponent(GandalfPersistenceManager.java:516)
        at org.netbeans.modules.form.GandalfPersistenceManager.loadComponent(GandalfPersistenceManager.java:635)
        at org.netbeans.modules.form.GandalfPersistenceManager.loadForm(GandalfPersistenceManager.java:370)
        at org.netbeans.modules.form.FormEditorSupport$5.run(FormEditorSupport.java:550)
        at org.netbeans.modules.form.FormLAF$1.run(FormLAF.java:58)
        at org.openide.util.Mutex.doEventAccess(Mutex.java:932)
        at org.openide.util.Mutex.readAccess(Mutex.java:201)
        at org.netbeans.modules.form.FormLAF.executeWithLookAndFeel(FormLAF.java:43)
        at org.netbeans.modules.form.FormEditorSupport.loadFormData(FormEditorSupport.java:548)
        at org.netbeans.modules.form.FormEditorSupport.access$100(FormEditorSupport.java:38)
[catch] at org.netbeans.modules.form.FormEditorSupport$1.run(FormEditorSupport.java:136)
        at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:178)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:454)
        at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:201)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:151)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:145)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:137)
        at java.awt.EventDispatchThread.run(EventDispatchThread.java:100)