title: class "SynchronousHelper"'s signer information does not match signer information of other classes in the same package
body: <p>I already know that there are other topics about this but i can't find the answer to my problems.
  I've downloaded morena's package to use Twain and WIA api, because i need to make a java application which use local scanner to do document's scan.
  I have one single jar with all the classes i need and I've put this in my project folder correctly (I use net beans to program), and I've done a test application that allow to use my epson scanner and do the scan.
  When i run this error appears: Exception in thread "main" java.lang.SecurityException: class "SynchronousHelper"'s signer information does not match signer information of other classes in the same package.</p>
  
  <p>In the other topics, some users suggest to open the manifest and delete all the signature but when i do this, net beans mark an error because there aren't signatures.
  Someone has an idea?
  Sorry if there are some grammars mistakes but i'm italian.
  thanks to everyone.</p>
  
  <pre><code>import eu.gnome.morena.*;
  import java.awt.image.BufferedImage;
  import java.util.List;
  
  public class main {
      public static void main(String[] args) throws Exception {
        Manager manager = Manager.getInstance();
         //Vector that contains the references to all my local scanners
         List&lt;? extends Device&gt; devices = manager.listDevices();
          //the position [0] contains my epson scanner
       Device device = (Device) devices.get(0);
       if (device instanceof Scanner) {
  
       Scanner scanner = (Scanner) device;
       scanner.setMode(Scanner.RGB_8);
       scanner.setResolution(75);
       scanner.setFrame(100, 100, 500, 500);
  
       } else if (device instanceof Camera) {
  
       }
  
       //SynchronousHelper--&gt; the class that make problems 
       BufferedImage bimage = SynchronousHelper.scanImage(device);
  
  
      System.out.println("Informazioni del file scannerizzato: dimensioni=(" +              bimage.getWidth() + ", " + bimage.getHeight() + ")   bit mode=" + bimage.getColorModel().getPixelSize());
       Thread.sleep(30000);
  }
  }
  </code></pre>