For the next time, you can click that red history block and see the error message. You will also see a “bug” icon and if you click that icon you get a more detailed error message.
Hello. How did you resolve this error? I am trying to work on the tutorial, but get stuck at this step since when I execute the velveth, it gives me the same error. Thank you for your help.
Someone kindly answered me and said: "Technically this tool is deprecated. That said, you can try adjusting the input datatype to be “fastq” instead of “fastqsanger” to avoid the specific reason your job failed.
The job may still fail even after changing the datatype: for format reasons (interleaved may be problematic) or for resource reasons (different errors – likely reported as an out-of-memory error). But the above is worth testing out."
I was using Galaxy.org at the time, and it worked for me when I tried fastq instead of fastqsanger.