hello moshu,
am facing the same problem, my site is also hosted on yahoo webhosting. I have a blog with “Customizable Permalinks” plugin activated.
https://friendscyberclub.com/blog/feed/ – when i check for validation it gives error – https://feedvalidator.org/check.cgi?url=http%3A%2F%2Ffriendscyberclub.com%2Fblog%2Ffeed%2F
also i can not use the feed with feedburner as it says error or invalid feed,
waiting for your reply,
thanks and regards,
uttoransen,