Error on JXDatePicker - need some help

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I'm using the swingx0.9.3, made a form using matisse(netbeans 6.1) put two JXDatePicker on the form, everything works on netbeans, if I click preview, I can play with JXDatepicker and everything, but when running the application I got the below errors, it happens exactly when matisse tries to instantiate JXDatePicker inside the code I can't even alter. Is on initcomponents method.

Does anyone can help me? thanks.

Exception in thread "AWT-EventQueue-0" java.lang.NoClassDefFoundError: org/jdesktop/swingx/calendar/JXMonthView
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:169)
at org.jdesktop.swingx.plaf.LookAndFeelAddons.getUI(LookAndFeelAddons.java:280)
at org.jdesktop.swingx.JXMonthView.updateUI(JXMonthView.java:773)
at org.jdesktop.swingx.JXMonthView.<init>(JXMonthView.java:324)
at org.jdesktop.swingx.JXMonthView.<init>(JXMonthView.java:264)
at org.jdesktop.swingx.JXDatePicker.initMonthView(JXDatePicker.java:327)
at org.jdesktop.swingx.JXDatePicker.init(JXDatePicker.java:319)
at org.jdesktop.swingx.JXDatePicker.<init>(JXDatePicker.java:247)
at org.jdesktop.swingx.JXDatePicker.<init>(JXDatePicker.java:198)
at br.com.nastek.self.sysdata.client.sound.SearchSound.initComponents(SearchSound.java:190)
at br.com.nastek.self.sysdata.client.sound.SearchSound.<init>(SearchSound.java:89)
at br.com.nastek.self.sysdata.client.sound.JSoundView.btnSearchActionPerformed(JSoundView.java:453)
at br.com.nastek.self.sysdata.client.sound.JSoundView.access$1200(JSoundView.java:44)
at br.com.nastek.self.sysdata.client.sound.JSoundView$12.actionPerformed(JSoundView.java:351)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2028)
at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2351)
at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:387)
at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:242)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:236)
at org.jvnet.substance.utils.RolloverButtonListener.mouseReleased(RolloverButtonListener.java:110)
at java.awt.AWTEventMulticaster.mouseReleased(AWTEventMulticaster.java:272)
at java.awt.Component.processMouseEvent(Component.java:6126)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3265)
at java.awt.Component.processEvent(Component.java:5891)
at java.awt.Container.processEvent(Container.java:2102)
at java.awt.Component.dispatchEventImpl(Component.java:4497)
at java.awt.Container.dispatchEventImpl(Container.java:2160)
at java.awt.Component.dispatchEvent(Component.java:4327)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4366)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4030)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3960)
at java.awt.Container.dispatchEventImpl(Container.java:2146)
at java.awt.Window.dispatchEventImpl(Window.java:2440)
at java.awt.Component.dispatchEvent(Component.java:4327)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:599)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:300)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:210)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:200)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:195)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:187)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:121)
Caused by: java.lang.ClassNotFoundException: org.jdesktop.swingx.calendar.JXMonthView
at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
at java.lang.ClassLoader.loadClass(ClassLoader.java:316)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:288)
at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:374)
... 42 more
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