Come together with the global Drupal community in Rotterdam, 28 Sept – 1 Oct 2026. Sessions, contribution, connection, and Early Bird savings until 8 June.With:
- drupal/core: 9.5.9
- drupal/csv_serialization: 3.0.0
- symfony/serializer: v4.4.47
I'm getting:
Fatal error: Declaration of Drupal\csv_serialization\Encoder\CsvEncoder::encode($data, string $format, array $context = []): string must be compatible with Symfony\Component\Serializer\Encoder\EncoderInterface::encode($data, $format, array $context = []) in web/modules/contrib/csv_serialization/src/Encoder/CsvEncoder.php on line 122
Issue fork csv_serialization-3364978
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Start within a Git clone of the project using the version control instructions.
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Comments
Comment #3
claudiu.cristeaReady
Comment #4
markdorisonHey @claudiu.cristea! Version 3.0 is not supported on D9. You will need to upgrade to 3.x at the same time you update Drupal core as it is not possible to support both Drupal 9.x and 10.x in a single release due to a breaking change in
EncoderInterface::encode()between Symfony 4.4 (D9) and Symfony 6.2 (D10).When preparing for an upgrade to Drupal 10 we recommend that you widen your Composer version constraints to allow either 2.x or 3.x:
composer require drupal/csv_serialization:^2.0 || ^3.0. This will allow the module to be automatically upgraded when you upgrade Drupal core.Marking this as "works as designed" even though "designed" isn't really the right word here. Really it's working as expected, though not as we would wish.
Comment #5
claudiu.cristea@markdorison, fair enough. Thanks