title: Can't open JFoenix-window
body: <p>Whenever I try to open my JFoenix programm the same error message appears in the console...
  When I use the standard JavaFx components everything works nice</p>
  
  <p>Information about the Java, I use:
  I have already imported the JFoenix library into eclipse; 
  I use jdk1.8.0_111;
  I have the newest JFoenix jar</p>
  
  <p>That's the error: </p>
  
  <p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
  <div class="snippet-code">
  <pre class="snippet-code-html lang-html prettyprint-override"><code>    Exception in Application start method
  java.lang.reflect.InvocationTargetException
   at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
   at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
   at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
   at java.lang.reflect.Method.invoke(Method.java:498)
   at com.sun.javafx.application.LauncherImpl.launchApplicationWithArgs(LauncherImpl.java:389)
   at com.sun.javafx.application.LauncherImpl.launchApplication(LauncherImpl.java:328)
   at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
   at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
   at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
   at java.lang.reflect.Method.invoke(Method.java:498)
   at sun.launcher.LauncherHelper$FXHelper.main(LauncherHelper.java:767)
  Caused by: java.lang.RuntimeException: Exception in Application start method
   at com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:917)
   at com.sun.javafx.application.LauncherImpl.lambda$launchApplication$155(LauncherImpl.java:182)
   at java.lang.Thread.run(Thread.java:745)
  Caused by: java.lang.UnsupportedClassVersionError: com/jfoenix/controls/JFXButton has been compiled by a more recent version of the Java Runtime (class file version 53.0), this version of the Java Runtime only recognizes class file versions up to 52.0
   at java.lang.ClassLoader.defineClass1(Native Method)
   at java.lang.ClassLoader.defineClass(ClassLoader.java:763)
   at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
   at java.net.URLClassLoader.defineClass(URLClassLoader.java:467)
   at java.net.URLClassLoader.access$100(URLClassLoader.java:73)
   at java.net.URLClassLoader$1.run(URLClassLoader.java:368)
   at java.net.URLClassLoader$1.run(URLClassLoader.java:362)
   at java.security.AccessController.doPrivileged(Native Method)
   at java.net.URLClassLoader.findClass(URLClassLoader.java:361)
   at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
   at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
   at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
   at javafx.fxml.FXMLLoader.loadTypeForPackage(FXMLLoader.java:2916)
   at javafx.fxml.FXMLLoader.loadType(FXMLLoader.java:2905)
   at javafx.fxml.FXMLLoader.importClass(FXMLLoader.java:2846)
   at javafx.fxml.FXMLLoader.processImport(FXMLLoader.java:2692)
   at javafx.fxml.FXMLLoader.processProcessingInstruction(FXMLLoader.java:2661)
   at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2517)
   at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2441)
   at javafx.fxml.FXMLLoader.load(FXMLLoader.java:2409)
   at application.Main.start(Main.java:26)
   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.win.WinApplication._runLoop(Native Method)
   at com.sun.glass.ui.win.WinApplication.lambda$null$148(WinApplication.java:191)
   ... 1 more
  Exception running application application.Main</code></pre>
  </div>
  </div>
  </p>
  
  <p>My Main class:</p>
  
  <p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
  <div class="snippet-code">
  <pre class="snippet-code-html lang-html prettyprint-override"><code>package application;
   
  import java.io.IOException;
  
  import javafx.application.Application;
  import javafx.fxml.FXMLLoader;
  import javafx.stage.Stage;
  import javafx.scene.Scene;
  import javafx.scene.layout.AnchorPane;
  
  
  public class Main extends Application {
   
   private AnchorPane root;
   private Stage primaryStage;
   
   @Override
   public void start(Stage primaryStage) {
    try {
    
     this.primaryStage = primaryStage;
     this.primaryStage.setTitle("SimpleMySQLConnector - Login");
     
     FXMLLoader load;
     load = new FXMLLoader(getClass().getResource("/application/LoginScreen.fxml"));
     root = load.load();
     Scene scene = new Scene(root);
     primaryStage.setScene(scene);
     primaryStage.show();
     
    } catch(Exception e) {
     e.printStackTrace();
     
    }
   }
   
   public static void main(String[] args) {
    launch(args);
    
   }
  }</code></pre>
  </div>
  </div>
  </p>
  
  <p><div class="snippet" data-lang="js" data-hide="true" data-console="false" data-babel="false">
  <div class="snippet-code snippet-currently-hidden">
  <pre class="snippet-code-html lang-html prettyprint-override"><code>package application;
   
  import java.io.IOException;
  
  import javafx.application.Application;
  import javafx.fxml.FXMLLoader;
  import javafx.stage.Stage;
  import javafx.scene.Scene;
  import javafx.scene.layout.AnchorPane;
  
  
  public class Main extends Application {
   
   private AnchorPane root;
   private Stage primaryStage;
   
   @Override
   public void start(Stage primaryStage) {
    try {
    
     this.primaryStage = primaryStage;
     this.primaryStage.setTitle("SimpleMySQLConnector - Login");
     
     FXMLLoader load;
     load = new FXMLLoader(getClass().getResource("/application/LoginScreen.fxml"));
     root = load.load();
     Scene scene = new Scene(root);
     primaryStage.setScene(scene);
     primaryStage.show();
     
    } catch(Exception e) {
     e.printStackTrace();
     
    }
   }
   
   public static void main(String[] args) {
    launch(args);
    
   }
  }</code></pre>
  </div>
  </div>
  </p>
  
  <p>That's the fxml file:</p>
  
  <p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
  <div class="snippet-code">
  <pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;?xml version="1.0" encoding="UTF-8"?&gt;
  
  &lt;?import com.jfoenix.controls.JFXButton?&gt;
  &lt;?import com.jfoenix.controls.JFXCheckBox?&gt;
  &lt;?import com.jfoenix.controls.JFXPasswordField?&gt;
  &lt;?import com.jfoenix.controls.JFXTextField?&gt;
  &lt;?import javafx.scene.control.Label?&gt;
  &lt;?import javafx.scene.layout.AnchorPane?&gt;
  &lt;?import javafx.scene.paint.LinearGradient?&gt;
  &lt;?import javafx.scene.paint.Stop?&gt;
  &lt;?import javafx.scene.text.Font?&gt;
  
  &lt;AnchorPane prefHeight="700.0" prefWidth="1118.0" style="-fx-background-color: #000000;" xmlns="http://javafx.com/javafx/9.0.1" xmlns:fx="http://javafx.com/fxml/1"&gt;
     &lt;children&gt;
        &lt;AnchorPane layoutX="587.0" layoutY="55.0" prefHeight="590.0" prefWidth="500.0" style="-fx-background-color: #0a52c9;"&gt;
           &lt;children&gt;
              &lt;JFXTextField focusColor="#fafafa" layoutX="109.0" layoutY="156.0" prefHeight="42.0" prefWidth="282.0" promptText="Benutzername" unFocusColor="#3fd6f4"&gt;
                 &lt;font&gt;
                    &lt;Font name="Arial" size="18.0" /&gt;
                 &lt;/font&gt;
              &lt;/JFXTextField&gt;
              &lt;JFXPasswordField focusColor="WHITE" layoutX="112.0" layoutY="279.0" prefHeight="42.0" prefWidth="282.0" promptText="Passwort" unFocusColor="#3fd6f4"&gt;
                 &lt;font&gt;
                    &lt;Font size="18.0" /&gt;
                 &lt;/font&gt;
              &lt;/JFXPasswordField&gt;
              &lt;JFXButton layoutX="204.0" layoutY="375.0" prefHeight="42.0" prefWidth="91.0" style="-fx-background-color: #3fd6f4;" text="Login" textFill="WHITE"&gt;
                 &lt;font&gt;
                    &lt;Font name="Arial" size="18.0" /&gt;
                 &lt;/font&gt;
              &lt;/JFXButton&gt;
              &lt;JFXCheckBox layoutX="159.0" layoutY="479.0" text="Angemeldet bleiben" textFill="WHITE"&gt;
                 &lt;font&gt;
                    &lt;Font name="Arial" size="18.0" /&gt;
                 &lt;/font&gt;
              &lt;/JFXCheckBox&gt;
              &lt;Label layoutX="188.0" layoutY="58.0" text="Login"&gt;
                 &lt;font&gt;
                    &lt;Font name="Arial" size="50.0" /&gt;
                 &lt;/font&gt;
                 &lt;textFill&gt;
                    &lt;LinearGradient endX="1.0" endY="1.0"&gt;
                       &lt;stops&gt;
                          &lt;Stop color="#3fd6f4" /&gt;
                          &lt;Stop color="WHITE" offset="1.0" /&gt;
                       &lt;/stops&gt;
                    &lt;/LinearGradient&gt;
                 &lt;/textFill&gt;
              &lt;/Label&gt;
           &lt;/children&gt;
        &lt;/AnchorPane&gt;
        &lt;Label layoutX="28.0" layoutY="44.0" prefHeight="198.0" prefWidth="582.0" text="Willkommen bei" textAlignment="CENTER"&gt;
           &lt;font&gt;
              &lt;Font name="Arial" size="30.0" /&gt;
           &lt;/font&gt;
           &lt;textFill&gt;
              &lt;LinearGradient endX="1.0" endY="1.0"&gt;
                 &lt;stops&gt;
                    &lt;Stop color="#00eade" /&gt;
                    &lt;Stop color="WHITE" offset="1.0" /&gt;
                 &lt;/stops&gt;
              &lt;/LinearGradient&gt;
           &lt;/textFill&gt;
        &lt;/Label&gt;
        &lt;Label layoutX="28.0" layoutY="183.0" text="SimpleMySQLConnector"&gt;
           &lt;textFill&gt;
              &lt;LinearGradient endX="1.0" endY="1.0"&gt;
                 &lt;stops&gt;
                    &lt;Stop color="#02dbea" /&gt;
                    &lt;Stop color="WHITE" offset="1.0" /&gt;
                 &lt;/stops&gt;
              &lt;/LinearGradient&gt;
           &lt;/textFill&gt;
           &lt;font&gt;
              &lt;Font size="40.0" /&gt;
           &lt;/font&gt;
        &lt;/Label&gt;
     &lt;/children&gt;
  &lt;/AnchorPane&gt;</code></pre>
  </div>
  </div>
  </p>
  
  <p>I hope you're able to help me with these Information</p>