Recently I posted about the tablebase display saying "Oops, sorry!" if you enter an impossible position via FEN (lichess.org/forum/lichess-feedback/impossible-pawn-causes-wrong-error-message-in-opening-book--tablebase-display).
Now I'm getting this error message for all positions with 7 or fewer pieces, including quite normal ones that shouldn't cause any problems.
This is probably not related, but just in case it helps:
I first encountered this when I entered this (valid) FEN position:
8/8/8/k7/8/3RK3/5p2/8 b - - 0 1
I later found that this position mysteriously leads to a "No data" error in this online version of the Nalimov tablebases: http://chessok.com/?page_id=361 (which can otherwise handle this combination of pieces). That seems like a weird coincidence, so a wild guess might be that there's a problem with this position in the tablebase and that somehow crashed something (seems unlikely, but then so does the coincidence).
Now I'm getting this error message for all positions with 7 or fewer pieces, including quite normal ones that shouldn't cause any problems.
This is probably not related, but just in case it helps:
I first encountered this when I entered this (valid) FEN position:
8/8/8/k7/8/3RK3/5p2/8 b - - 0 1
I later found that this position mysteriously leads to a "No data" error in this online version of the Nalimov tablebases: http://chessok.com/?page_id=361 (which can otherwise handle this combination of pieces). That seems like a weird coincidence, so a wild guess might be that there's a problem with this position in the tablebase and that somehow crashed something (seems unlikely, but then so does the coincidence).
