Been attempting to weed out stocks that are not associated with the Morningstar sector code of 103 (Financial Institutions... codes given as per this post), but have also receiving an error message specifying that Filters used in the screen argument of creating a pipeline have to be either NoneType or a Filter object, rather than a boolean which is what is produced.
However, as per Quantopian tutorials, a boolean should work (final example). Does a Factor need to be involved? What separates the boolean in Lesson 5 that's used in the screen argument from mine? How can I fix this?