![[SOLVED] Installation failed, reverting ./composer.json and ./composer.lock to their original content. [RuntimeException] Could not delete /sites/default/default.settings.php or default.services.yml](https://knowledgebase.ibuild.ph/wp-content/uploads/2023/06/RuntimeException-error-could-not-delete-default-files-780x328.jpg "[SOLVED] Installation failed, reverting ./composer.json and ./composer.lock to their original content. [RuntimeException] Could not delete /sites/default/default.settings.php or default.services.yml 1")
On Drupal 8, 9, or even Drupal 10, you might encounter any of the following error messages when running Drush or Composer commands in the command line. For instance, any of these errors can happen while installing a new module via composer, or running drush updb, or any CLI commands:.
(UPDATED and tested for latest Drupal 11) Installing the required Webform libraries to your Drupal 9, D10, and D11 websites can be such a mess, oftentimes messing around with your composer file and causing errors, and rendering your D9 or D10 website unusable. The documentation and different options and ways.
Website page suddenly blank or downloads? Check your cache first
October 3, 2026
Website form emails emails not arriving with Google Workspace or Microsoft 365? Check cPanel mail routing
August 31, 2026
Drupal 11 Metatag: How to use the Body field as a fallback when the Summary is empty
July 15, 2026
[FIXED] Backup and Migrate: Missing Backup Source or Destination in Drupal 11 (requires Composer and Drush)
July 13, 2026![[SOLVED] Installation failed, reverting ./composer.json and ./composer.lock to their original content. [RuntimeException] Could not delete /sites/default/default.settings.php or default.services.yml](https://secure.gravatar.com/avatar/15cb8ca56433adf21cfc970406eee69c2f892133203dc9af93c7eb9d6b32289c?s=96&d=mm&r=g)
Follow us