Following lots of Googling on this, I did see a similar problem highlighted here:
But it was never followed up with logs…
What is interesting in my logs, it that the 3 retries all occur within the same second:
2017/05/16 00:05:03 ERROR : Attempt 1/3 failed with 1 errors and: directory not found
2017/05/16 00:05:03 ERROR : Attempt 2/3 failed with 1 errors and: directory not found
2017/05/16 00:05:03 ERROR : Attempt 3/3 failed with 1 errors and: directory not found
2017/05/16 00:05:03 Failed to purge: directory not found