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JavaFx Mouse click event on fontawesome icon not working

 
philip nikoi
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I have a javafx application with a fontawesome icon inside. when i run the application i get this error. Error resolving onMouseClicked='#closeButtonAction', either the event handler is not in the Namespace or there is an error in the script.

My controller =>


My FXML file =>

the intellisense reads Handler method is not accessible,make public or annotate with @FXML when i hover on #closeButtonAction
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