How to fix parsing error of WordPress Feed for XML

When I happened to visit my Rss,I found my XML went to some problem.It said like below

XML parsing error: xml processing instruction not in the beginning of an external entity
Location: http://www.tiham.com/feed/
Line: 2, column: 3

Reasons: Generally,it is caused by the empty line of the first line of XML file.
Solution:
* Check the wp-config.php file to see if the program outside the empty rows.
* Check your wp-rss2.php, wp-atom.php file to see if the program outside the empty rows.
* Check functions.php file to see if the program outside the empty rows.

<? php?> things, if the empty line, then remove the empty line, the general inspection is completed the three, you can solve the problem.
PS: blank line means, such as? “Or <? Php; the back (front) also follow the other lines, though not the content.
* If nothing works, the last one method: one by one “activate / deactivate the” plug-in, check where the problem lies at to see source code, if it is caused by blank lines, delete the blank lines, RSS to normal.

While seeing this,I realized that several days ago,I add some thing to functions.php.It may be this problem.Then I checked the functions.php,It really is.I deleted the empty line out of ?>This is How I fixed this parsing error of Wordpress Feed for XML.

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