>>> [!note] Migrated issue <!-- Drupal.org comment --> <!-- Migrated from issue #3414631. --> Reported by: [milan.durovic](https://www.drupal.org/user/3555230) Related to !15 >>> <h3 id="summary-problem-motivation">Problem/Motivation</h3> <p>Cannot re-install Aggregator module.</p> <h4 id="summary-steps-reproduce">Steps to reproduce</h4> <p>I installed Aggregator module and defined a feed. I also had a view that was using the feed.<br> I then uninstalled the Aggregator using "Extend/Uninstall" form in the standard administration menu. This was successful.<br> I then tried to install the Aggregator module via "Extend/List" administration menu, by ticking the checkbox next to Aggregator module.<br> I got the error message: "Unable to install Aggregator, filter.format.aggregator_html already exists in active configuration."<br> I tried clearing the cache and installing again, but it didn't help.</p> <h3 id="summary-proposed-resolution">Proposed resolution</h3> <h3 id="summary-remaining-tasks">Remaining tasks</h3> <h3 id="summary-ui-changes">User interface changes</h3> <h3 id="summary-api-changes">API changes</h3> <h3 id="summary-data-model-changes">Data model changes</h3>