Since you upgraded from a previous version, your "Namespace ID of the Default Namespace" may still be set to a forum ID value. Since 2.1.0, this should be an ID value from the Namespace Manager.
Originally Posted by pegasus
If you are upgrading from a version prior to 2.1.0, make sure that the Namespace ID of the Default Namespace matches a namespace ID from left column of the Namespace Manager (default: 6) and is not a forum ID.
As I mentioned above, this wasn't really a bug, but I marked it as fixed because I added an annoying error message for admins if the Default Namespace isn't defined correctly.
The Statistics page error requires a rewrite, so that will have to wait for the next build. As for the categories, in vault/extensions/category/special/special_uncategorized.php and [SAME]/special_mostcategories.php, find:
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