ProjectWise "Cannot remove the Electrical project Configuration File"

Hello,

After having removed the Substation Workspace project and Substation workarea projects and folders, (also removed from the deleted items) we still get the same message

"Cannot remove the Electrical project Configuration File"" for any file in any folder from ProjectWise we want to delete. Also in admin and super admin role.

There is nothing assigned in the Workspaces in ProjectWise Administrator.

Thank you very much in adavce for any ideas,

Best regards,

Nicolas Tobbackx