Exit Code 0 on ACD 'directory not found' error (All retries fail)

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