Title: Fatal error message: Call to undefined function
Last modified: August 19, 2016

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# Fatal error message: Call to undefined function

 *  Resolved [mandeville49](https://wordpress.org/support/users/mandeville49/)
 * (@mandeville49)
 * [17 years, 11 months ago](https://wordpress.org/support/topic/fatal-error-message-call-to-undefined-function/)
 * Upgraded to 2.5.1 using the automatic upgrade plugin:
 * Can someone help me sort this one? When I open “comments” I get:
 * Fatal error: Call to undefined function: show_manual_subscription_form() in /
   home/www/burn-a-book/wordpress2/wp-content/themes/Copy of jelly/comments.php 
   on line 101
 * Even though is shows the fatal error message, the comments are still shown.

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

 *  [MichaelH](https://wordpress.org/support/users/michaelh/)
 * (@michaelh)
 * [17 years, 11 months ago](https://wordpress.org/support/topic/fatal-error-message-call-to-undefined-function/#post-759377)
 * show_manual_subscription_form is not a native WordPress function so guess you
   have a plugin causing the problem.
 * Deactivate Plugins and see if that solves the problem. Make sure you have up-
   to-date plugins.
 *  Moderator [Samuel Wood (Otto)](https://wordpress.org/support/users/otto42/)
 * (@otto42)
 * WordPress.org Admin
 * [17 years, 11 months ago](https://wordpress.org/support/topic/fatal-error-message-call-to-undefined-function/#post-759380)
 * It could also be some kind of file missing in the theme. Or the fact that your
   theme is in a folder named “Copy of jelly”. Spaces in theme folder names are 
   not good.

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

The topic ‘Fatal error message: Call to undefined function’ is closed to new replies.

## Tags

 * [fatal error message](https://wordpress.org/support/topic-tag/fatal-error-message/)
 * [undefined function](https://wordpress.org/support/topic-tag/undefined-function/)
 * [wp-content](https://wordpress.org/support/topic-tag/wp-content/)

 * In: [Installing WordPress](https://wordpress.org/support/forum/installation/)
 * 2 replies
 * 3 participants
 * Last reply from: [Samuel Wood (Otto)](https://wordpress.org/support/users/otto42/)
 * Last activity: [17 years, 11 months ago](https://wordpress.org/support/topic/fatal-error-message-call-to-undefined-function/#post-759380)
 * Status: resolved

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