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Could be that Discoverer does not know which items to group within a Page Item. I've seen situation when All is selected that ths data is returned but when a single Page Item is selected an error is thrown. This is because the same item would logically be associated with 2 different page items, not very common I know but this was my cause.
To fix it I had to insert additional logic into my conditions to only pull items that would group into single page items. This is very hard to explain or reproduce but just a hint as to what the cause was in my situation.