ew only if the er- ror prejudices the party's substantial rights and would result in a miscarria of justice if left un- corrected." United States I McCoun, 468 F.3d 1088, 1093 (8th Cir.2006), cert. denied,— U.S. ---, 127 S.Ct. 1866, 167 L.Ed.2d 356 (2007) (quotation omitted). *889 Paragraph three of