code: private void unregisterTargets( Set<String> newTargetIds ) {
  
  		for( String targetId : newTargetIds ) {
  			try {
  				this.targetsMngr.deleteTarget( targetId );
  
  			} catch( Exception e ) {
  				this.logger.severe( "A target ID that has just been registered could not be created. That's weird." );
  				Utils.logException( this.logger, e );
  			}
  		}
  	}
docs: Unregisters targets.
  @param newTargetIds a non-null set of target IDs