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javafx.fxml.LoadException: JFXButton is not a valid type.
/home/michael/important/projects/assignments/graphics_2/out/production/graphics_2/main/main.fxml:36	at javafx.fxml.FXMLLoader.constructLoadException(FXMLLoader.java:2597)	at javafx.fxml.FXMLLoader.createElement(FXMLLoader.java:2774)	at javafx.fxml.FXMLLoader.processStartElement(FXMLLoader.java:2704)	at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2527)	at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2441)	at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3214)	at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3175)	at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3148)	at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3124)	at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3104)	at javafx.fxml.FXMLLoader.load(FXMLLoader.java:3097)	at main.Main.start(Main.java:13)	at com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$162(LauncherImpl.java:863)	at com.sun.javafx.application.PlatformImpl.lambda$runAndWait$175(PlatformImpl.java:326)	at com.sun.javafx.application.PlatformImpl.lambda$null$173(PlatformImpl.java:295)	at java.security.AccessController.doPrivileged(Native Method)	at com.sun.javafx.application.PlatformImpl.lambda$runLater$174(PlatformImpl.java:294)	at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95)	at com.sun.glass.ui.gtk.GtkApplication._runLoop(Native Method)	at com.sun.glass.ui.gtk.GtkApplication.lambda$null$49(GtkApplication.java:139)	at java.lang.Thread.run(Thread.java:745)