Try moving the king onto the rook. Sometimes that helps.
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I am playing a Chess960 as Black where i got to the position where my King is at c8 and my Rook at a8. I wanted to castle Queenside. Both K and R have not been moved, the squares between them as well as the R's destination square d8 are empty and none are under attack. but when i tried to put the R at d8, the program whishked it back to a8. I tried this several times w/ the same result. What am i doing wrong? Or am i misunderstanding the castling rules?