Unable to find root of site structure for site &1. See previous message &2.
&1 - The identification of the site
&2 - The ID of a previous message thrown containing more information about the
error
When a user accesses a site and when he logs in - the "top" of the site being
loaded is determined based on the site structure.
All site elements, which are direct children of the Site Root can be used as the
top element being loaded for the user. The element chosen is decided based
on the authorization level, that the user has obtained.
Check the referenced previous message for more specific information about why
the error occurred.
Check whether the top elements (children of the site root) are defined
correctly.
Make sure that at least one of the top elements has an authorization level that corresponds to the anonymous user. This will ensure that regardless which user logs in then contents will be displayed.