title: Delphi 7 QuickReport Preview Error
body: <p>Im using Delphi7 and QuickReport 3.
  Im new to Delphi and QuickReport.</p>
  
  <p>When I debug my application I got an error at the procedure TQRPreview.UpdateZoom;</p>
  
  <pre><code>if assigned(FQRPrinter)
  </code></pre>
  
  <p>The exception is Access violation</p>
  
  <p>In my form Im calling , QuickRep.Prepare;and QuickRep.Preview.</p>
  
  <p>When Im calling QuickRep.Preview I'm geeting the error.</p>
  
  <p>Any help is appreciated.</p>