A customer of mine had a problem in a it’s SharePoint 2010 farm. An error occurred while creating a sub site of type Enterprise Wiki. The user that tried to create the sub site was not a site collection administrator and did not have Full Control permissions.
1. Try to create the sub site:
2. Press “Create” button:
Error: “An error has occurred while processing your request.”
3. Retry with the same name for the sub site:
Error: “The Web site address … is already in use.”
At the same moment a site collection administrator could successfully create a Enterprise Wiki sub site!
I could solve the problem and reproduce it in my testing environment: The security settings of the site collections masterpage catalog had broken inheritance and nobody had any rights on this list. This does not seems to be a problem in most cases but it’s a problem while creating a Enterprise Wiki sub site. – Adding “read” access for “All authenticated users” solved the problem.