AWS DataSync some errors in your task execution. No affected files in CloudWatch logs

Question

I'm getting this error when I run a DataSync task:

Transfer and verification completed. There were some errors in your task execution. See a list of affected files in CloudWatch logs. If no files are listed in CloudWatch logs, contact AWS Support.

The error code is:

CompleteWithErrorLogsWithNoVerificationErrorTaskReports

The error happens during the prepare phase.

I have no idea how to further debug this or what could cause this to happen. The task stopped working randomly; it might be a temporary bug.

Answer 1

After contacting AWS Support, they got back to us with an answer.

In the S3 bucket we had a path as such:

s3://<BUCKET_NAME>//test/path/file.txt

DataSync didn't like the double slash since it's not valid in most file systems. So, after renaming the bad path, everything worked.