but then I get ``` Error:(28, 45) Kotlin: Type mi...
# tornadofx
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but then I get
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Error:(28, 45) Kotlin: Type mismatch: inferred type is TableColumn<out Any!, out Any!>! but Nothing! was expected. Projected type ObservableList<out TableColumn<out Any!, out Any!>!>! restricts use of public abstract fun add(element: E!): Boolean defined in javafx.collections.ObservableList