@Override
 public void onModifyFailed(final Property property, final Throwable t) {
   Console.error(
       "Failed to modify " + property.getName(),
       "Error modifying "
           + property.getName()
           + " = "
           + property.getValue()
           + " at "
           + addressTemplate
           + "/"
           + attribute
           + ": "
           + t.getMessage());
 }
 @Override
 public void onRemoveFailed(final Property property, final Throwable t) {
   Console.error(
       "Failed to remove " + property.getName(),
       "Error removing "
           + property.getName()
           + " = "
           + property.getValue()
           + " from "
           + addressTemplate
           + "/"
           + attribute
           + ": "
           + t.getMessage());
 }
 @Override
 public void onAddFailed(final Property property, final Throwable t) {
   Console.error(
       "Failed to add " + property.getName(),
       "Error adding "
           + property.getName()
           + " = "
           + property.getValue()
           + " to "
           + addressTemplate
           + "/"
           + attribute
           + ": "
           + t.getMessage());
 }