RSS Feed XML Parsing Error

The problem is definitely the blank line at the beginning of the feed: https://validator.w3.org/feed/check.cgi?url=http%3A%2F%2Famanasha.org%2Fwordpress%2F%3Ffeed%3Drss2

This is usually injected by a poorly coded plugin or theme.

Try deactivating all plugins. If that resolves the issue, reactivate each one individually until you find the cause.

If that does not resolve the issue, try switching to the Twenty Fourteen theme to rule-out a theme-specific issue (theme functions can interfere like plugins).

I tried by Deactiving all the Plugins but still Feed does not works.
Also treid by ReInstalling WordPress but Still feed does not works. It is not working with other Themes also.
Any Idea on which Files might be poorly coded injected. I can try by checking in that file.
The Error message shows “Line Number 2, Column 1 but on which Files ?

It is not working with other Themes also.

Did you try specifically with the Twenty Fourteen theme?

Any Idea on which Files might be poorly coded injected.

The feed is dynamically generated, so it really could be almost any file.

If it’s still broken with the Twenty Fourteen theme and no active plugins, try downloading WordPress again and delete then replace your copies of everything except the wp-config.php file and the /wp-content/ directory with fresh copies from the download. This will effectively replace all of your core files without damaging your content and settings. Some uploaders tend to be unreliable when overwriting files, so don’t forget to delete the original files before replacing them.

Thanks James.
I replaced these files feed.php, feed-atom.php, feed-atom-comments.php, feed-rdf.php, feed-rss.php, feed-rss2.php, feed-rss2-comments.php. & it worked now.
One general question: As you said; i can replace all the files except wp-config.php. Is WordPress Installation different than other windows .EXE installation where if i manually removed the files then it will corrupt the installation. But in WordPress as you suggested we can replace the Files Manually.
Is that Safe completely to replace Files. If so then if i encounter any problem in PROD Site then this might be good options.

WordPress Installation different than other windows .EXE installation where if i manually removed the files then it will corrupt the installation.

Yes, very different, because WordPress is not a Windows .EXE installation. It’s web software. ??

Is that Safe completely to replace Files.

Yes, it’s safe to delete and replace everything except the wp-config.php file and the /wp-content/ directory with fresh copies.