Great, thank you for posting the extra details.
Your GTF data does have header lines. Try removing those, then rerun.
What to do → Remove the headers with the Select tool using the option “NOT Matching” with the regular expression: ^#
If that is not enough, please post back the parameters used for the job. Find those on the Dataset Details view, right above where the logs are located. Expand the datasets to show the metadata and peek view.
The first FAQ I sent explains exactly where to find that: by clicking the 
icon within dataset. That provides more details than the bug icon, and is always a good place to review, for any failure.