title: Error importing jfxtra jar into scene builder 2.0
body: <p>I'm creating an app using <a href="http://jfxtras.org" rel="nofollow">JFXtras</a> in Scene Builder 2 but I'm unable to import the <code>jfxtras-all-8.0-r5.jar</code> file into Scene Builder. When I show the JAR Analysis report in Scene Builder I get errors similar to the one shown below for every single class. How do I fix this issue?</p>
  
  <pre><code>Exception for: jfxtras/internal/scene/control/skin/agenda/AgendaDayListSkin.class
  javafx.fxml.LoadException: 
  unknown path:2
  at javafx.fxml.FXMLLoader.constructLoadException(FXMLLoader.java:2617)
  at javafx.fxml.FXMLLoader.access$700(FXMLLoader.java:104)
  at javafx.fxml.FXMLLoader$InstanceDeclarationElement.constructValue(FXMLLoader.java:1012)
  at javafx.fxml.FXMLLoader$ValueElement.processStartElement(FXMLLoader.java:740)
  at javafx.fxml.FXMLLoader.processStartElement(FXMLLoader.java:2723)
  at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2527)
  at javafx.fxml.FXMLLoader.load(FXMLLoader.java:2425)
  at com.oracle.javafx.scenebuilder.kit.library.util.JarExplorer.instantiateWithFXMLLoader(JarExplorer.java:105)
  at com.oracle.javafx.scenebuilder.kit.library.util.JarExplorer.exploreEntry(JarExplorer.java:146)
  at com.oracle.javafx.scenebuilder.kit.library.util.JarExplorer.explore(JarExplorer.java:65)
  at com.oracle.javafx.scenebuilder.kit.library.user.LibraryFolderWatcher.exploreAndUpdateLibrary(LibraryFolderWatcher.java:298)
  at com.oracle.javafx.scenebuilder.kit.library.user.LibraryFolderWatcher.runDiscovery(LibraryFolderWatcher.java:122)
  at com.oracle.javafx.scenebuilder.kit.library.user.LibraryFolderWatcher.run(LibraryFolderWatcher.java:88)
  at java.lang.Thread.run(Thread.java:744)
  Caused by: java.lang.InstantiationException: jfxtras.internal.scene.control.skin.agenda.AgendaDayListSkin
  at java.lang.Class.newInstance(Class.java:418)
  at sun.reflect.misc.ReflectUtil.newInstance(ReflectUtil.java:51)
  at javafx.fxml.FXMLLoader$InstanceDeclarationElement.constructValue(FXMLLoader.java:1010)
  ... 11 more
  Caused by: java.lang.NoSuchMethodException: jfxtras.internal.scene.control.skin.agenda.AgendaDayListSkin.&lt;init&gt;()
  at java.lang.Class.getConstructor0(Class.java:2971)
  at java.lang.Class.newInstance(Class.java:403)
  ... 13 more
  </code></pre>