Running Modena causes Exception. It spits out long Exception trace but the relevant exception seems to be:

java.lang.UnsupportedOperationException
        at java.util.Collections$UnmodifiableList.add(Collections.java:1364)
        at javafx.collections.ListChangeBuilder.nextRemove(ListChangeBuilder.java:208)
        at javafx.collections.ObservableListBase.nextRemove(ObservableListBase.java:150)