Where the record identifies no conduct that matches the clearly established and uncontested elements of the crime of conviction, is the district court's error in accepting the guilty plea under Federal Rules of Criminal Procedure 11(b)(8) "plain," regardless of whether the precedent has established the quantum of evidence the Government was required to prove?

Whether the district court's error in accepting the guilty plea under Federal Rules of Criminal Procedure 11(b)(8) is 'plain' where the record identifies no conduct that matches the clearly established and uncontested elements of the crime of conviction