Fatal error: Class "Drupal\package_manager\StageBase" not found

Created on 18 August 2025, about 2 months ago

Problem/Motivation

I updated ckeditor5_plugin_pack to 1.4.0 which installed 1.5.0 version of ckeditor5_premium_features and the site started experiencing fatal errors when I ran drush cr or drush updb:

PHP Fatal error: Uncaught Error: Class "Drupal\package_manager\StageBase" not found in /var/www/html/public_html/modules/contrib/ckeditor5_premium_features/src/ComposerInstaller/Installer.php:17

I searched for the StageBase class in the Package Manager module and found it has been renamed to SandboxManagerBase as per this change record, https://www.drupal.org/node/3521441 →

Steps to reproduce

Update CKEditor 5 Premium Features to the latest version
Run drush cr
Fatal error occurs

🐛 Bug report

Status

Active

Version

1.5

Component

Code

Created by

🇳🇬Nigeria chike Nigeria

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Merge Requests

!34Fatal error: Class "Drupal\package_manager\StageBase" not found
Open
🇳🇬Nigeria chike
updated about 1 month ago

Comments & Activities

Issue created by @chike
Merge request !34Update Installer.php to use the current SandboxManagerBase class instead of... → (Open) created by chike
Comment about 2 months ago →
🇳🇬Nigeria chike Nigeria
First commit to issue fork.
Comment about 1 month ago →
🇵🇱Poland salmonek
Hi Ferdinand,

Thank you for bringing this to our attention and your fix.
I have added a LegacyInstaller class for compatibility with <11.2

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Fatal error: Class "Drupal\package_manager\StageBase" not found

Problem/Motivation

Steps to reproduce

Merge Requests

!34Fatal error: Class "Drupal\package_manager\StageBase" not foundOpen

Comments & Activities

!34Fatal error: Class "Drupal\package_manager\StageBase" not found
Open