Exception in thread "JavaFX Application Thread" java.lang.ClassCastException: class javafx.scene.control.TextArea cannot be cast to class javafx.scene.control.ComboBox $($javafx$.$scene.control.TextArea and javafx.scene.control.ComboBox are in module javafx.controls@$21\mathrm{.}0\mathrm{.}1$ of loader 'app'$)$

at application.AddEntry.saveBookToQueue$($AddEntry$.$java:$121)$

at application.AddEntry.saveBooksInQueue$($AddEntry$.$java:$162)$

at application.EventManager$HandleSave.handle$($EventManager$.$java:$86)$

at application.EventManager$HandleSave.handle$($EventManager$.$java:$83)$