Hi @Mainak_Bardhan,
It looks like the server/software/installation issue. Thank you for bringing it to our attention!
I completed a similar job on Galaxy Australia.
Ping @jennaj, it seems Annotate DESeq2/DEXSeq does not work on the ORG server. In the tutorial it is used with the default settings. I tried uncompressed annotation file, but no success. It works in Australia.
Kind regards,
Igor