Title: Version 0.1.9.3 Activation Error:
Last modified: September 2, 2016

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# Version 0.1.9.3 Activation Error:

 *  [nmcleish](https://wordpress.org/support/users/nmcleish/)
 * (@nmcleish)
 * [13 years, 1 month ago](https://wordpress.org/support/topic/version-0193-activation-error/)
 * Hi all. This looks like it has promise but when I try to activate it, I get this
   error:
    Fatal error: Call to undefined function register_field() in /[path_to_my_blog](http://codex.wordpress.org/path_to_my_blog)/
   blog/wp-content/plugins/buckets/buckets.php on line 76 There is no function in
   that file with that name. Does anyone have any ideas please?
 * Thanks in advance.
 * Neil.

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

 *  [Donna McMaster](https://wordpress.org/support/users/mcdonna/)
 * (@mcdonna)
 * [13 years, 1 month ago](https://wordpress.org/support/topic/version-0193-activation-error/#post-7759359)
 * Neil, register_field() is a function defined by the Advanced Custom Fields plugin(
   ACF). The line of code you reference is checking to see whether that plugin is
   active before calling register_field() but evidently that call is failing.
 * If you don’t have ACF installed, I suggest that you install and activate it, 
   and then try again.
 *  [Donna McMaster](https://wordpress.org/support/users/mcdonna/)
 * (@mcdonna)
 * [13 years, 1 month ago](https://wordpress.org/support/topic/version-0193-activation-error/#post-7759360)
 * Well, I spoke too soon. This is a bug that was caused by an incompatibility with
   version 4 of ACF. The developer is aware of it, so hopefully we will see a fix
   soon.

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

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 * 2 replies
 * 2 participants
 * Last reply from: [Donna McMaster](https://wordpress.org/support/users/mcdonna/)
 * Last activity: [13 years, 1 month ago](https://wordpress.org/support/topic/version-0193-activation-error/#post-7759360)