Overview

When installing the CleanUrl module on Omeka S 4.1.x, the following error occurred.

Laminas\ServiceManager\Exception\ServiceNotCreatedException
Service with name "Omeka\Acl" could not be created. Reason: Resource id 'Omeka\Controller\Site\Page' already exists in the ACL

This issue had also been reported in the following forum.

Error Installing version 4.1
Here’s the text of the message, if I delete the AdvancedSearch module the same happens on another module etc… Blockquote Omeka S encountered an error Laminas\ServiceManager\Exception\ServiceNotCreatedException Service with name “Omeka\Acl” could not be created. Reason: Resource id ‘Omeka\Controller\Site\Page’ already exists in the ACL Details: Laminas\Permissions\Acl\Exception\InvalidArgumentException: Resource id ‘Omeka\Controller\Site\Page’ already exists in the ACL in …/bsd/vendor/lam...
Omeka Forum

Solution

The issue was resolved by downgrading to Omeka S 4.0.x.

Summary

I hope you find this helpful.