Como resolver esse erro?

Exception in thread “AWT-EventQueue-0” java.lang.ClassCastException: Cannot cast java.util.Vector$1 to java.lang.Boolean

at java.lang.Class.cast(Class.java:3369)

at org.jdesktop.beansbinding.Binding.convertForward(Binding.java:1312)

at org.jdesktop.beansbinding.Binding.getSourceValueForTarget(Binding.java:844)

at org.jdesktop.beansbinding.Binding.refreshUnmanaged(Binding.java:1222)

at org.jdesktop.beansbinding.Binding.refresh(Binding.java:1207)

at org.jdesktop.beansbinding.AutoBinding.tryRefreshThenSave(AutoBinding.java:162)

at org.jdesktop.beansbinding.AutoBinding.bindImpl(AutoBinding.java:199)

at org.jdesktop.beansbinding.Binding.bindUnmanaged(Binding.java:959)

at org.jdesktop.beansbinding.Binding.bind(Binding.java:944)

at org.jdesktop.beansbinding.BindingGroup.bind(BindingGroup.java:143)

at br.edu.ifgoiano.mini_projeto.Aluno.initComponents(Aluno.java:298)

at br.edu.ifgoiano.mini_projeto.Aluno.(Aluno.java:10)

at br.edu.ifgoiano.mini_projeto.Aluno$8.run(Aluno.java:363)

at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:311)

at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:756)

at java.awt.EventQueue.access$500(EventQueue.java:97)

at java.awt.EventQueue$3.run(EventQueue.java:709)

at java.awt.EventQueue$3.run(EventQueue.java:703)

at java.security.AccessController.doPrivileged(Native Method)

at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76)

at java.awt.EventQueue.dispatchEvent(EventQueue.java:726)

at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)

at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)

at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)

at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)

at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)

at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)