src/main/java/com/conveyal/gtfs/error/NewGTFSError.java
public static NewGTFSError forFeed (NewGTFSErrorType errorType, String badValue) {
        return new NewGTFSError(null, errorType).setBadValue(badValue);
    }
public static NewGTFSError forFeed (NewGTFSErrorType errorType, String badValue) {
        return new NewGTFSError(null, errorType).setBadValue(badValue);
    }
Factory Builder for feed-wide error