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com.sun.javafx.fxml.PropertyNotFoundException: Property "customEvent" does not exist or is read-only.	at javafx.fxml.FXMLLoader$Element.processValue(FXMLLoader.java:348)	at javafx.fxml.FXMLLoader$Element.processPropertyAttribute(FXMLLoader.java:325)	at javafx.fxml.FXMLLoader$Element.processInstancePropertyAttributes(FXMLLoader.java:235)	at javafx.fxml.FXMLLoader$ValueElement.processEndElement(FXMLLoader.java:767)	at javafx.fxml.FXMLLoader.processEndElement(FXMLLoader.java:2823)	at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2532)