Xref: GROMACS initial setup - #4 by jennaj
Did the tutorial work? Just curious! 
Then, if you need more help, please share back your history so we can check if this is a server problem, or something with your data itself. The most common reason for errors with this tool is missing annotation inside the PDB and the logs will note that, but it is a bit complicated, and we can try to help to diagnose that.
How to share is in the banner at this forum, or see here directly → How to get faster help with your question. A shared history link is best for this since we’ll need access to all of the job logs, and that is difficult to capture with screenshots. But you decide how quickly you want this to be resolved.
Thanks!