failfailure expression:

xfer = , duration= seconds. failfailure reason: xfer$ is not an objectxfer$ is not an object failfailure reason: xfer$.duration is not a numberxfer$.duration is not a number failfailure reason: xfer$.duration is less than or equal to 0xfer$.duration is less than or equal to 0 pass failfailure reason: block after xferblock after xfer