When you order by column in saved search it gives you a list of all the available fields - however if the option selected is not available in the view it throws an error.
I would have thought the order by column drop down should only show the fields available in that view to prevent the error
This is a bug. When we transitioned to saved searches, we did not account for the sort field in the list of fields specified in the select statement. We have fixed this issue and we will be releasing a build shortly.
Our next build will change the way we handle sorting. Where as we previously did the sorting in the DataView, the next build will do the sorting in the database. Actually, it was the introduction of saved searches that pushed us to relying upon the DataView sorting, but we have reworked the code so that the sorting in all list views and sub-panels now rely upon the order by clause in the select statement.
Hey the saved searches feature is great however it is implemented :)