title: MPDF img tag error
body: <p>I have a problem with the mpdf library.</p>
  
  <p>When I insert a img tag the library I received error 500.</p>
  
  <p>This is my code:</p>
  
  <pre><code>&lt;?php
  
  
    $tabla = $this-&gt;load-&gt;view("prueba",$data , true);
    $this-&gt;load-&gt;library('mpdf');
  
    //size
    $mpdf = new mPDF('utf-8','Letter',0,0,10.1,10.1,32,29,13.2,13.2);
    $mpdf-&gt;showImageErrors = true;
  
  
    $stylesheet = file_get_contents('assets/css/bootstrap/css/bootstrap.min.css');
    $mpdf-&gt;WriteHTML($stylesheet,1);
  
    $mpdf-&gt;SetHTMLHeader('&lt;div class="cabecera"&gt; &lt;img src="assets/img/asd.png"&gt;&lt;/div&gt;');
  
    $mpdf-&gt; WriteHTML ($tabla,2);
  
    $mpdf-&gt; SetHTMLFooter('&lt;div class="footer"&gt; &lt;span&gt; some text!&lt;/span&gt;&lt;/div&gt;');
    $mpdf-&gt;Output('files/daniel.pdf','F');
  
    $this-&gt;response("True", 200);
  ?&gt;
  </code></pre>
  
  <p>If I do that even without the tag IMG everything works fine.</p>
  
  <p>Help me please.</p>