Hi Aashish,
Thank you for getting in touch.
As we suspected, you have disabled the Author Archives.
Please enable it to continue accessing the author archives.
However, we do not recommend that unless you have a multi-author blog and you need the author archives. These usually introduce duplicate content issues on your website.
Hope that helps and please do not hesitate to let us know if you need our assistance with anything else.
Hello,
Since we did not hear back from you for 15 days, we are assuming that you found the solution. We are closing this support ticket.
If you still need assistance or any other help, please feel free to open a new support ticket, and we will be more than happy to assist.
Thank you.