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01100001 Wrapped Exception (with status template): 01100002 Failed to execute script 'classpath*:alfresco/templates/webscripts/org/alfresco/repository/site/sites.post.json.js': 01100001 Access Denied. You do not have the appropriate permissions to perform this operation
That's probably right…However you can argue that the create button should not be shown if it doesn't work. That's probably a minor bug…