title: "Wkhtmltopdf didn't return any data" with CakePHP
body: <p>I am running a CakePHP 2.8 environment and want to print a PDF with wkhtmltopdf. Once, I could create an PDF, then, I didn't used it for few weeks because I was working on something else. Today I restarted to work on that and got the error Message:</p>
  
  <pre><code>"WKHTMLTOPDF didn't return any data" 
  
  APP/Plugin/CakePdf/Pdf/CakePdf.php line 236 → WkHtmlToPdfEngine-&gt;output()
  APP/Plugin/CakePdf/View/PdfView.php line 97 → CakePdf-&gt;output(string)
  CORE/Cake/Controller/Controller.php line 963 → PdfView-&gt;render(null, null)
  CORE/Cake/Routing/Dispatcher.php line 200 → Controller-&gt;render()
  CORE/Cake/Routing/Dispatcher.php line 167 → Dispatcher-&gt;_invoke(InvoicesController, CakeRequest)
  APP/webroot/index.php line 109 → Dispatcher-&gt;dispatch(CakeRequest, CakeResponse)
  </code></pre>
  
  <p>My machine is a MacBook Pro with El Capitan. Furthermore, I thought that it might be the El Capitan Update, but then I installed wkhtmltopdf to an equal system with CakePHP 2.8 and it is running on this machine. Unfortunately, I have no idea what I can do. I reinstalled wkhtml and updated CakePHP again, but no chance :-( </p>
  
  <p>Can anyone help me?</p>