Exception in Application start method

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//Main

import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.stage.Stage;

public class Main extends Application {

    @Override
    public void start(Stage primaryStage) throws Exception{
        Parent root = FXMLLoader.load(getClass().getResource("Views/sample.fxml"));
        primaryStage.setTitle("Hello World");
        primaryStage.setScene(new Scene(root, 1000, 600));
        primaryStage.show();
    }

    public static void main(String[] args) {
        launch(args);
    }
}

//Sample.fxml

<?xml version="1.0" encoding="UTF-8"?>

<?import javafx.scene.control.Button?>
<?import javafx.scene.layout.AnchorPane?>
<?import javafx.scene.layout.HBox?>
<?import javafx.scene.layout.VBox?>
<?import javafx.scene.text.Text?>

<AnchorPane prefHeight="400.0" prefWidth="600.0" xmlns="http://javafx.com/javafx/11.0.1" xmlns:fx="http://javafx.com/fxml/1" fx:controller="Controllers.sampleController">
    <children>
        <HBox prefHeight="40.0" prefWidth="600.0">
            <children>
                <Button fx:id="addButton" mnemonicParsing="false" prefHeight="40.0" prefWidth="108.0" text="Добавить" />
                <Button fx:id="DeleteButton" mnemonicParsing="false" prefHeight="40.0" prefWidth="115.0" text="Удалить" />
                <Button fx:id="editButton" mnemonicParsing="false" prefHeight="40.0" prefWidth="133.0" text="Редактировать" />
            </children>
        </HBox>
        <VBox layoutY="40.0" prefHeight="360.0" prefWidth="600.0">
            <children>
                <Text fx:id="textField" strokeType="OUTSIDE" strokeWidth="0.0" text="Text" wrappingWidth="599.13671875" />
            </children>
        </VBox>
    </children>
</AnchorPane>