To fix the issue
1. Install and activate the fix-rss-feed plug-in
2. Go to Admin –> Setting -> Fix RSS Feed
3. Click on the “Fix WordPress RSS Feed” button
4. After the fix is completed, your WordPress feed should be up and running
the main reason for this is you probably tried to change your WP template and left a white space in the code
Hope this fixes your probblem
Khalid
