Receving following error while using PreferencesFx

[signalarun]

Exception in thread "JavaFX Application Thread" java.lang.AbstractMethodError: Receiver class org.kordamp.ikonli.fontawesome.FontAwesomeIkonHandler does not define or inherit an implementation of the resolved method 'abstract java.net.URL getFontResource()' of interface org.kordamp.ikonli.IkonHandler.
at org.kordamp.ikonli.javafx.IkonResolver.(IkonResolver.java:42)
at org.kordamp.ikonli.javafx.FontIcon.lambda$new$2(FontIcon.java:75)
at javafx.base/com.sun.javafx.binding.ExpressionHelper$Generic.fireValueChangedEvent(ExpressionHelper.java:360)
at javafx.base/com.sun.javafx.binding.ExpressionHelper.fireValueChangedEvent(ExpressionHelper.java:80)
at javafx.base/javafx.beans.property.ObjectPropertyBase.fireValueChangedEvent(ObjectPropertyBase.java:106)
at javafx.base/javafx.beans.property.ObjectPropertyBase.markInvalid(ObjectPropertyBase.java:113)
at javafx.base/javafx.beans.property.ObjectPropertyBase.set(ObjectPropertyBase.java:147)
at javafx.graphics/javafx.css.StyleableObjectProperty.set(StyleableObjectProperty.java:82)
at org.kordamp.ikonli.javafx.FontIcon.setIconCode(FontIcon.java:215)
at org.kordamp.ikonli.javafx.FontIcon.(FontIcon.java:96)
at com.dlsc.preferencesfx.view.UndoRedoBox.(UndoRedoBox.java:32)
at com.dlsc.preferencesfx.PreferencesFx.init(PreferencesFx.java:71)
at com.dlsc.preferencesfx.PreferencesFx.(PreferencesFx.java:64)
at com.dlsc.preferencesfx.PreferencesFx.(PreferencesFx.java:55)
at com.dlsc.preferencesfx.PreferencesFx.of(PreferencesFx.java:102)