Проблема с прожигом фида

Помогите, пожалуйста, с настройкой RSS. Совсем не разбираюсь в фидах. Попробовала прожечь фид на feedburner.com — выпадает следующая ошибка:

The URL does not appear to reference a valid XML file. We encountered the following problem: Error on line 2: The processing instruction target matching «[xX][mM][lL]» is not allowed.
Identify Feed Source
Back to My Feeds

The feed URL you entered is:

http://arifulinrashid.ru/feed/

We could not find a valid feed at that address. Here are some possible reasons this might have happened:

Is the feed valid? Confirm its validity now.

The feed your site already creates needs to be “valid enough” to work with FeedBurner. This post from the FeedBurner Help Center explains why technical validity matters.

Are you using the URL of the web page or the URL of the feed?

FeedBurner is usually able to «auto-discover» your feed from a web page, but in this case we didn’t find any related feeds. You may want to enter the URL of the feed directly.

Is the URL is misspelled or a copy+paste action didn’t work?

If that’s the case, please try again.

Что делать? Посоветуйте или дайте ссылку на уже готовую инструкцию по такой проблеме.