Title: Fatal error: Call to undefined function WP Default Theme
Last modified: August 19, 2016

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# Fatal error: Call to undefined function WP Default Theme

 *  Resolved [inspired2write](https://wordpress.org/support/users/inspired2write/)
 * (@inspired2write)
 * [16 years, 1 month ago](https://wordpress.org/support/topic/fatal-error-call-to-undefined-function-wp-default-theme/)
 * I’m doing some troubleshooting on my site so I disabled all my plugins, and I
   also selected to revert back to the WP default theme:
 * [http://wordpress.org/extend/themes/default](http://wordpress.org/extend/themes/default)
 * However, when I selected the default theme I’m getting an error message while
   in both the preview mode, as well as if I publish it, I get the same header error
   message on the front end. I was able to revert back to my preferred theme, but
   even though I’m not wanting to use the default theme, I would like to know why
   I’m getting this error with the default theme:
 * `Fatal error: Call to undefined function: home_url() in /home/myname/mysiteurl.
   com/wp-content/themes/default/header.php on line 41`
 * Line 41 of the default template, is this code:
 * `<h1><a href="<?php echo home_url(); ?>/"><?php bloginfo('name'); ?></a></h1>`
 * Could it be caused by some other themes I have installed, even though they’re
   not activated? Or caused by what? Thanks in advance for your help. If you need
   to view my source code, the site is: linkandblog (dot com).

Viewing 2 replies - 1 through 2 (of 2 total)

 *  [esmi](https://wordpress.org/support/users/esmi/)
 * (@esmi)
 * [16 years, 1 month ago](https://wordpress.org/support/topic/fatal-error-call-to-undefined-function-wp-default-theme/#post-1454137)
 * Line 41 in my version of Kubrick is:
 * `<h1><a href="<?php echo get_option('home'); ?>/"><?php bloginfo('name'); ?></
   a></h1>`
 * Could you have a 3.0 default theme on a 2.9.1 install?
 *  Thread Starter [inspired2write](https://wordpress.org/support/users/inspired2write/)
 * (@inspired2write)
 * [16 years, 1 month ago](https://wordpress.org/support/topic/fatal-error-call-to-undefined-function-wp-default-theme/#post-1454205)
 * Thank you Esmi,
    Yes, you were correct. I had accidentally deleted the WP Default
   theme, and rather than grabbing a copy of it from the 2.9.1 files, I took it 
   from the url I provided above. Replacing that with the correct one eliminated
   the header error I was getting. It now has the same code on line 41 as what you
   showed.
 * One problem down, but still others to resolve.
    THANK YOU ESMI!

Viewing 2 replies - 1 through 2 (of 2 total)

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## Tags

 * [fatal error](https://wordpress.org/support/topic-tag/fatal-error/)

 * In: [Fixing WordPress](https://wordpress.org/support/forum/how-to-and-troubleshooting/)
 * 2 replies
 * 2 participants
 * Last reply from: [inspired2write](https://wordpress.org/support/users/inspired2write/)
 * Last activity: [16 years, 1 month ago](https://wordpress.org/support/topic/fatal-error-call-to-undefined-function-wp-default-theme/#post-1454205)
 * Status: resolved

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