Exporting to S3 fails (at least when using the Data Prep runtime)

Steps to reproduce

• Perform a fresh install on Windows using the June 23rd Installer (20170623_1246)
• Create an S3 dataset
• Do 1 preparation step
• Try to export to S3 (CSV file, default record and field delimiters)

Current behavior

• The export fails with the so-helpful error message in the task history
  
• Logs are attached (Data Prep & TCOMP)

Expected behavior

Something like "I can export my preparation to S3"

Notes

• Interestingly, I don't always get exactly the same error in the logs. I made 4 attempts (all visible in the logs):
  • First one at 8:59pm on a dataset containing exactly 10k rows
  • The next 3 ones on a dataset containing 100k rows. For each attempt, I tried with different record and field delimiters and I have slightly different errors in the logs.
  • Exporting to S3 fails as well if you select Avro or Parquet
  • Exporting to S3 fails even if the source dataset is not S3 (I tried with a local CSV file and got the same "output type not supported")
• I've attached the source datasets (both were uploaded to S3 via the S3 management console)