Session As Signer – Note to myself

If this code returns Null

public static Session getSessionAsSigner() {
 Session sessionAsSigner = null;
 try {
  FacesContext context = JSFUtil.getFacesContext();
  sessionAsSigner = (Session) context.getApplication().getVariableResolver().resolveVariable(context,"sessionAsSigner");
 } catch (Exception e) {
 Util.logError(e);
 }
 return sessionAsSigner;
 } 

Then your code might have been signed by different user / servers.. Just sign it with your user ID and try again.