Confused about Stream Enrich -> S3Loader Step

For engineers
4

With the data (LZO) living in that bucket, running my EMR runner:

E, [2018-09-26T21:14:42.121423 #4374] ERROR – : No run folders in [s3://piv-stream-data-prod-bucket/] found

I am running:
[ec2-user@ip-172-31-8-153 ~]$ ./snowplow-emr-etl-runner run -c emr.yaml -r resolver.json -t targets -d -f shred

targets has correct redshift config, and relevant emr:

enriched:
        good: s3://piv-stream-data-prod-bucket/       # e.g. s3://my-out-bucket/enriched/good
        bad: s3://piv-stream-data-prod-bucket-bad/        # e.g. s3://my-out-bucket/enriched/bad
        errors: # Leave blank unless :continue_on_unexpected_error: set to true below
        archive: # Where to archive enriched events to, e.g. s3://my-archive-bucket/enriched
        stream: s3://piv-stream-data-prod-bucket # stream bucket
      shredded:
        good: s3://piv-prod-shredded-good       # e.g. s3://my-out-bucket/shredded/good
        bad: s3://piv-prod-shredded-bad        # e.g. s3://my-out-bucket/shredded/bad
        errors: # Leave blank unless :continue_on_unexpected_error: set to true below
        archive: # Where to archive shredded events to, e.g. s3://my-archive-bucket/shredded

There is clearly compressed s3 loaded data in that bucket, what am I doing wrong?