Alguém já usou o cafeteira?

Galera,


Alguém já usou o cafeteira para desenvolver GUI? Não estou conseguindo, guando clico em geração dá o seguinte erro





Exception occurred during event dispatching:


java.lang.NoSuchMethodError


        at cafeteira.MstGerar.geraClasse(MstGerar.java:79)


        at cafeteira.MstGerar.mostra(MstGerar.java:75)


        at cafeteira.MstGerar.(MstGerar.java:34)


        at cafeteira.Principal.acionaGerar(Principal.java:172)


        at cafeteira.Principal.access$300(Principal.java:16)


        at cafeteira.Principal$4.actionPerformed(Principal.java:73)


        at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)


        at javax.swing.AbstractButton$ForwardActionEvents.actionPerformed(Unknow


n Source)


        at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)


        at javax.swing.DefaultButtonModel.setPressed(Unknown Source)


        at javax.swing.AbstractButton.doClick(Unknown Source)


        at javax.swing.plaf.basic.BasicMenuItemUI$MouseInputHandler.mouseRelease


d(Unknown Source)


        at java.awt.Component.processMouseEvent(Unknown Source)


        at java.awt.Component.processEvent(Unknown Source)


        at java.awt.Container.processEvent(Unknown Source)


        at java.awt.Component.dispatchEventImpl(Unknown Source)


        at java.awt.Container.dispatchEventImpl(Unknown Source)


        at java.awt.Component.dispatchEvent(Unknown Source)


        at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)


        at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)


        at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)


        at java.awt.Container.dispatchEventImpl(Unknown Source)


        at java.awt.Window.dispatchEventImpl(Unknown Source)


        at java.awt.Component.dispatchEvent(Unknown Source)


        at java.awt.EventQueue.dispatchEvent(Unknown Source)


        at java.awt.EventDispatchThread.pumpOneEventForHierarchy(Unknown Source)





        at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)


        at java.awt.EventDispatchThread.pumpEvents(Unknown Source)


        at java.awt.EventDispatchThread.run(Unknown Source)