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java.lang.ArrayIndexOutOfBoundsException: -1	at java.util.ArrayList.remove(ArrayList.java:401)	at javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:253)	at javax.faces.component.UIViewRoot.processValidators(UIViewRoot.java:343)	at com.sun.faces.lifecycle.ProcessValidationsPhase.execute(ProcessValidationsPhase.java:78)	at com.sun.faces.lifecycle.LifecycleImpl.phase(LifecycleImpl.java:200)	at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:90)	at javax.faces.webapp.FacesServlet.service(FacesServlet.java:197)