Estoy literalmente desesperada. No sé por qué, pero cada vez que intento ejecutar mi programa sale este error. Estoy usando Netbeans, con Java 10.0.2 para tener JavaFX ya instalado. Creo que es por algún problema con el archivo FXML. ¿Me puedes ayudar?

 java.lang.reflect.InvocationTargetException at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.base/java.lang.reflect.Method.invoke(Method.java:564) at javafx.graphics/com.sun.javafx.application.LauncherImpl.launchApplicationWithArgs(LauncherImpl.java:473) at javafx.graphics/com.sun.javafx.application.LauncherImpl.launchApplication(LauncherImpl.java:372) at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.base/java.lang.reflect.Method.invoke(Method.java:564) at java.base/sun.launcher.LauncherHelper$FXHelper.main(LauncherHelper.java:941) Caused by: java.lang.RuntimeException: Exception in Application start method at javafx.graphics/com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:973) at javafx.graphics/com.sun.javafx.application.LauncherImpl.lambda$launchApplication$2(LauncherImpl.java:198) at java.base/java.lang.Thread.run(Thread.java:844) Caused by: javafx.fxml.LoadException: Root hasn't been set. Use method setRoot() before load. file:/C:/Users/User/Documents/NetBeansProjects/gruppo71/dist/run2124011701/gruppo71.jar!/gruppo71/FXMLDocument.fxml:13 at javafx.fxml/javafx.fxml.FXMLLoader.constructLoadException(FXMLLoader.java:2621) at javafx.fxml/javafx.fxml.FXMLLoader.access$100(FXMLLoader.java:105) at javafx.fxml/javafx.fxml.FXMLLoader$RootElement.constructValue(FXMLLoader.java:1338) at javafx.fxml/javafx.fxml.FXMLLoader$ValueElement.processStartElement(FXMLLoader.java:754) at javafx.fxml/javafx.fxml.FXMLLoader.processStartElement(FXMLLoader.java:2722) at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2552) at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2466) at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3253) at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3210) at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3179) at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3152) at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3129) at javafx.fxml/javafx.fxml.FXMLLoader.load(FXMLLoader.java:3122) at gruppo71.Gruppo71.start(Gruppo71.java:21) at javafx.graphics/com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$9(LauncherImpl.java:919) at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runAndWait$11(PlatformImpl.java:449) at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater$9(PlatformImpl.java:418) at java.base/java.security.AccessController.doPrivileged(Native Method) at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater$10(PlatformImpl.java:417) at javafx.graphics/com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:96) at javafx.graphics/com.sun.glass.ui.win.WinApplication._runLoop(Native Method) at javafx.graphics/com.sun.glass.ui.win.WinApplication.lambda$runLoop$3(WinApplication.java:175) ... 1 more Exception running application gruppo71.Gruppo71 Java Result: 1

Mi principal es este:

 import javafx.application.Application; import javafx.fxml.FXMLLoader; import javafx.scene.Parent; import javafx.scene.Scene; import javafx.stage.Stage; /** * * @author User */ public class Gruppo71 extends Application { @Override public void start(Stage stage) throws Exception { Parent root = FXMLLoader.load(getClass().getResource("FXMLDocument.fxml")); Scene scene = new Scene(root); stage.setScene(scene); stage.show(); } /** * @param args the command line arguments */ public static void main(String[] args) { launch(args); } }

Mi código FXML es:

 <?import javafx.scene.control.Button?> <?import javafx.scene.control.ContextMenu?> <?import javafx.scene.control.DatePicker?> <?import javafx.scene.control.MenuItem?> <?import javafx.scene.control.SplitPane?> <?import javafx.scene.control.TableColumn?> <?import javafx.scene.control.TableView?> <?import javafx.scene.control.TextField?> <?import javafx.scene.layout.AnchorPane?> <fx:root id="AnchorPane" prefHeight="300.0" prefWidth="450.0" type="AnchorPane" xmlns="http://javafx.com/javafx/10.0.2" xmlns:fx="http://javafx.com/fxml/1" fx:controller="gruppo71.FXMLDocumentController"> <children> <SplitPane dividerPositions="0.13087248322147652" layoutX="28.0" orientation="VERTICAL" prefHeight="200.0" prefWidth="320.0" AnchorPane.bottomAnchor="0.0" AnchorPane.leftAnchor="0.0" AnchorPane.rightAnchor="0.0" AnchorPane.topAnchor="0.0"> <items> <AnchorPane minHeight="0.0" minWidth="0.0" prefHeight="100.0" prefWidth="160.0"> <children> <Button fx:id="aggiungiButton" layoutX="10.0" layoutY="5.0" mnemonicParsing="false" onAction="#addEvento" text="Aggiungi Evento" AnchorPane.bottomAnchor="5.0" AnchorPane.leftAnchor="10.0" AnchorPane.topAnchor="5.0" /> <DatePicker fx:id="dataPicker" layoutX="114.0" layoutY="6.0" prefHeight="26.0" prefWidth="150.0" AnchorPane.bottomAnchor="5.0" AnchorPane.leftAnchor="124.0" AnchorPane.topAnchor="5.0" /> <TextField fx:id="descriptionField" layoutX="285.0" layoutY="6.0" text="aggiungi descrizione..." AnchorPane.bottomAnchor="5.0" AnchorPane.leftAnchor="284.0" AnchorPane.rightAnchor="10.0" AnchorPane.topAnchor="5.0" /> </children> </AnchorPane> <AnchorPane minHeight="0.0" minWidth="0.0" prefHeight="100.0" prefWidth="160.0"> <children> <TableView fx:id="mainTab" layoutX="14.0" prefHeight="256.0" prefWidth="448.0" AnchorPane.bottomAnchor="0.0" AnchorPane.leftAnchor="0.0" AnchorPane.rightAnchor="0.0" AnchorPane.topAnchor="0.0"> <columns> <TableColumn fx:id="dataColumn" prefWidth="136.0" text="Data" /> <TableColumn fx:id="eventColumn" prefWidth="311.0" text="Evento" /> </columns> <contextMenu> <ContextMenu> <items> <MenuItem fx:id="removeButton" mnemonicParsing="false" onAction="#removeEvent" text="Rimuovi Evento" /> <MenuItem fx:id="importaButton" mnemonicParsing="false" onAction="#importCSV" text="Importa CSV" /> <MenuItem fx:id="exportButton" mnemonicParsing="false" onAction="#exportCSV" text="Esporta CSV" /> </items> </ContextMenu> </contextMenu> </TableView> </children> </AnchorPane> </items> </SplitPane> </children> </fx:root>

¡¡¡Toda la ayuda sería muy apreciada!!!