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com.sun.javafx.fxml.PropertyNotFoundException: Property "customEvent" does not exist or is read-only.	at javafx.fxml.FXMLLoader$Element.processValue(	at javafx.fxml.FXMLLoader$Element.processPropertyAttribute(	at javafx.fxml.FXMLLoader$Element.processInstancePropertyAttributes(	at javafx.fxml.FXMLLoader$ValueElement.processEndElement(	at javafx.fxml.FXMLLoader.processEndElement(	at javafx.fxml.FXMLLoader.loadImpl(