Hi @Dibya
Thanks for linked the tutorial but to help we would need to see your data and how you are using the workflow, plus the exact errors. We can still help if you would like to generate the history share link and post that back in a reply. Or, if you solves this, let us know! 
But in general, your inputs can be compared to the formats of the example data? For this workflow that is just a fasta file of an assembled genome. Fasta format is very common and if you search the tool panel you’ll find tools that can help to summarize and perform various QA and statistical summaries as a way to confirm the format.