>>> [!note] Migrated issue <!-- Drupal.org comment --> <!-- Migrated from issue #1833486. --> Reported by: [mikeryan](https://www.drupal.org/user/4420) >>> <p>It's a <a href="https://www.drupal.org/node/1778952">long story</a>, but due to fatal errors in certain environments triggered by Migrate's automated registration of migration and handler classes, as of Migrate 2.5 it will be possible to disable auto-registration, and any module implementing migration or handler classes should explicitly register them via hook_migrate_api() to continue working when auto-registration is disabled. Adding this registration will have no effect with Migrate 2.4 or earlier. </p>