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The portal delivered a block the request does not allow: one at or below a block it already delivered (a duplicate or an out-of-order block), one below the requested start, or one above the requested end. The message names the block and which of the three it is. Written as it came, the block would duplicate rows or store them out of order, so the pipe stops before the block reaches any transformer or target. Blocks with no matching data are skipped, so a gap between block numbers is not this error. Fix — none in user code; please report it against the portal. A restart resumes from the target’s persisted cursor.