Using latest version of domain (1.x-dev) and the latest dev version of this module (1.x-dev):
when I first tried to edit a domains languages I got the error as described here:
https://www.drupal.org/project/domain_language/issues/3129889 →
after that error is fixed (see patch in that issue) I now see another error when I try to edit a domains languages:
Argument 1 passed to Drupal\Core\Language\Language::Drupal\Core\Language\{closure}() must implement interface Drupal\Core\Language\LanguageInterface, null given
I notice that in order to be able to continue my work I could make a change in web/modules/contrib/domain_language/src/Form/DomainLanguageForm.php
transforming this line:
$languages = \Drupal::languageManager()->getNativeLanguages();
into this:
$languages = \Drupal::languageManager()->getLanguages();
because it seems that getNativeLanguages returns null.
Postponed: needs info
2.0
Code
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
Sadly I cannot test or confirm that the issue still exists in the 2.0x branch. I see that we don't have a project anymore that uses the domain_language module. Maybe our requirements changed because of changes to the domain module itself, or maybe because of the fact that we are using the domain_language_negotiation module.
But as far as I'm concerned, this ticket may be closed. It's an ancient one by now and noone else seems to have this issue.