Error for sentencing court not to consider reduction due to the fact that the conspiracy hadn't gotten very far along, but since the error entitled the deft to a greater reduction for acceptance of responsibility and the court subsequently varied downwards to a level beneath the correct guidelines range, there was no prejudice. Harmless error.
http://www.opn.ca6.uscourts.gov/opinions.pdf/18a0117p-06.pdf
Since 2011. An occasional commonplacing of the U.S. Circuit Courts of Appeal.
Neither an authoritative statement of the law nor legal advice. Quick work.