Runtime bug sur Netbeans "AWT-EventQueue-0"

Bonjour,
Je développe une application sur netbeans avec le modèle GUI, et tout allait bien, suaf que lorsque j'y ai ajouté quelques algorithmes conditionnels simples, j'obtine ce message d'erreur :

run: 
Exception in thread "AWT-EventQueue-0" java.lang.ClassCastException 
   at java.lang.Class.cast(Class.java:2990) 
   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 authentification.Tabs.initComponents(Tabs.java:958) 
   at authentification.Tabs.<init>(Tabs.java:27) 
   at authentification.Tabs$20.run(Tabs.java:1178) 
   at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209) 
   at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:641) 
   at java.awt.EventQueue.access$000(EventQueue.java:84) 
   at java.awt.EventQueue$1.run(EventQueue.java:602) 
   at java.awt.EventQueue$1.run(EventQueue.java:600) 
   at java.security.AccessController.doPrivileged(Native Method) 
   at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87) 
   at java.awt.EventQueue.dispatchEvent(EventQueue.java:611) 
   at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269) 
   at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184) 
   at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174) 
   at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169) 
   at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161) 
   at java.awt.EventDispatchThread.run(EventDispatchThread.java:122) 
BUILD SUCCESSFUL (total time: 9 seconds) 

J'ai essayé d'enlever les algorithmes que j'avais ajouté au code en les mettant en commentaire mais le problème réside, Quelqu'un peut il m'aider svp? c'est urgent!