SplFileObject::fputcsv() expects parameter 1 to be array, object given in SplCSVLoader.php on line 58

[brainOut]

If we use the example provided :
https://github.com/kiboko-labs/etl/blob/master/docs/pipeline.md#transform-the-contents-of-a-csv-file-into-another-file-format

<?php

use Kiboko\Component\ETL\Flow\Extractor;
use Kiboko\Component\ETL\Flow\Transformer;
use Kiboko\Component\ETL\Flow\Loader;
use Kiboko\Component\ETL\Pipeline;

$pipeline = new Pipeline\Pipeline(
    new Pipeline\PipelineRunner()
);

$pipeline
    ->extract(new Extractor\SplCSVExtractor(new SplFileObject(__DIR__ . '/input-file.csv', 'r')))
    ->transform(new Transformer\CallableTransformer(function($line) {
        return new Pipeline\GenericBucket([
            'title' => $line['Product name'],
            'identifier' => $line['SKU'],
            'public_price' => $line['Price Incl. Tax'],
        ]);
    }))
    ->load(new Loader\SplCSVLoader(new SplFileObject(__DIR__ . '/output-file.csv', 'w')))
    ->run();

The SplCSVLoader class throws an error due to the type mismatch of the first parameter.
here : https://github.com/kiboko-labs/etl/blob/master/Flow/Loader/SplCSVLoader.php#L58