title: Error while adding JavaFX files in eclipse
body: <p>I installed eclipse plugin <em>e(fx)clipse</em> to work with <em>JavaFX</em> and created a new JavaFX project. In the <em>Package Explorer</em> the project structure looks like this:</p>
  
  <p><a href="https://i.stack.imgur.com/fucU3.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/fucU3.jpg" alt="enter image description here"></a></p>
  
  <p>Further I'm trying to add to the project <em>JavaFX Main Class</em>:</p>
  
  <p><a href="https://i.stack.imgur.com/48dJ0.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/48dJ0.jpg" alt="enter image description here"></a></p>
  
  <p><a href="https://i.stack.imgur.com/zrx1S.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/zrx1S.jpg" alt="enter image description here"></a></p>
  
  <p>But this causes the following error in IDE:</p>
  
  <pre><code>!ENTRY org.eclipse.ui 4 0 2018-03-05 17:05:55.276
  !MESSAGE Unhandled event loop exception
  !STACK 0
  java.lang.NoSuchMethodError: org.eclipse.xtend2.lib.StringConcatenation.append(Ljava/lang/String;)V
      at org.eclipse.fx.ide.jdt.ui.internal.wizard.templates.ApplicationClassGenerator.generateContent(ApplicationClassGenerator.java:33)
      at org.eclipse.fx.ide.ui.wizards.AbstractNewJDTElementWizard.performFinish(AbstractNewJDTElementWizard.java:165)
  ...
  </code></pre>
  
  <p>and the same error occurs when I'm trying to add <em>New FXML Document</em> from <em>JavaFx section</em>. It seems that it's <a href="https://bugs.eclipse.org/bugs/show_bug.cgi?id=525746" rel="nofollow noreferrer">eclipse IDE bug</a>... But how to get round it?</p>