title: Can't create file using vertx
body: <p>I have tried to create/write an <code>AsyncFile</code> using the following methods, </p>
  
  <pre><code>vertx.fileSystem().writeFile("C:/Users/Asus/Desktop/filetwo.txt", buffer, new AsyncResultHandler&lt;Void&gt;{
  </code></pre>
  
  <p>and</p>
  
  <pre><code>vertx.fileSystem().open("filetwo.txt", new AsyncResultHandler&lt;AsyncFile&gt;(){
  </code></pre>
  
  <p>Neither method manages to create a new file and I can't figure out why. I have tried different formats for the file, but it makes no difference.</p>