>>> [!note] Migrated issue <!-- Drupal.org comment --> <!-- Migrated from issue #3068017. --> Reported by: [jayelless](https://www.drupal.org/user/213325) >>> <p>This error message is generated when trying to use a CSV import, because the "ids" array is duplicated when the plugin is constructed by the core migrate classes. The solution is to apply the patch from <span class="drupalorg-gitlab-issue-link project-issue-status-info project-issue-status-7"><a href="https://www.drupal.org/project/drupal/issues/3012001" title="Status: Closed (fixed)">#3012001: Duplications within migration process plugin</a></span> to Drupal core.</p> > Related issue: [Issue #3012001](https://www.drupal.org/node/3012001)