code: public static StringBuilder formatErrors( Collection<? extends RoboconfError> errors, Log log ) {
  
  		StringBuilder result = new StringBuilder();
  		for( Map.Entry<RoboconfError,String> entry : RoboconfErrorHelpers.formatErrors( errors, null, true ).entrySet()) {
  			if( entry.getKey().getErrorCode().getLevel() == ErrorLevel.WARNING )
  				log.warn( entry.getValue());
  			else
  				log.error( entry.getValue());
  
  			result.append( entry.getValue());
  			result.append( "\n" );
  		}
  
  		return result;
  	}
docs: Formats a Roboconf errors and outputs it in the logs.
  @param error an error
  @param log the Maven logger
  @return a string builder with the output