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After installing the latest version of CiviCRM (5.56.1) I cannot open my website anymore and log is showing this message:

Got error 'PHP message: Uncaught PHP Exception Exception: "Serialization of 'Closure' is not allowed" at /data/sites/web/instituutvlaamsevolkskunstbe/cms-install/4466-instituut-voor-vlaamse-volkskunst/production/vendor/civicrm/civicrm-core/CRM/Extension/ClassLoader.php line 85'

and drush cr returns:

Serialization of 'Closure' is not allowed

Drupal version 9.5.0 PHP version 7.4.33

I cannot find anything related

Thanks, Stefaan

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  • This did the trick ... > EDIT: composer 2.5.1 just released fixes it. composer self-update, then run composer install on the site to update the classloader. Thanks for your assistance ! Stefaan
    – Stefaan H
    Dec 24, 2022 at 13:24

1 Answer 1

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EDIT: composer 2.5.1 just released fixes it. composer self-update, then run composer install on the site to update the classloader.

Yes composer 2.5 is not compatible with civi yet. https://lab.civicrm.org/dev/core/-/issues/4046

Use composer self-update --rollback for now. And then run composer install again on your site.

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  • Hello Demerit, thanks for the info. the rollback fails ... any ideas on that ? Is there another way to roll back ?
    – Stefaan H
    Dec 24, 2022 at 13:17

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