Title: Error Migrator
Last modified: July 26, 2023

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# Error Migrator

 *  [cgcullarvega](https://wordpress.org/support/users/cgcullarvega/)
 * (@cgcullarvega)
 * [2 years, 8 months ago](https://wordpress.org/support/topic/error-migrator/)
 * Hello. When updating to the latest version, an error has been generated that 
   prevents the plugin from being activated:
 * The error it shows is the following: Fatal error: Uncaught Error: Call to undefined
   function MailPoet\Migrator\mb_strimwidth() in /var/www/recursos/wp-content/plugins/
   mailpoet/lib/Migrator/Migrator.php:79 Stack trace: #0 /var/www/recursos/wp-content/
   plugins/mailpoet/lib/Migrator/Migrator.php(35): MailPoet\Migrator\Migrator->getStatus()#
   1 /var/www/recursos/wp-content/plugins/mailpoet/lib/Config/Activator.php(78):
   MailPoet\Migrator\Migrator->run() #2 /var/www/recursos/wp-content/plugins/mailpoet/
   lib/Config/Activator.php(60): MailPoet\Config\Activator->processActivate() #3/
   var/www/recursos/wp-content/plugins/mailpoet/lib/Config/Initializer.php(288):
   MailPoet\Config\Activator->activate() #4 /var/www/recursos/wp-includes/class-
   wp-hook.php(308): MailPoet\Config\Initializer->runActivator() #5 /var/www/recursos/
   wp-includes/class-wp-hook.php(332): WP_Hook->apply_filters() #6 /var/www/recursos/
   wp-includes/plugin.php(517): WP_Hook->do_action() #7 /var/www/recursos/wp-admin/
   plugins.php(194): do_action() #8 {main} thrown in /var/www/recursos/wp-content/
   plugins/mailpoet/lib/Migrator/Migrator.php on line 79
 * How can we solve it?
 * The page I need help with: _[[log in](https://login.wordpress.org/?redirect_to=https%3A%2F%2Fwordpress.org%2Fsupport%2Ftopic%2Ferror-migrator%2F%3Foutput_format%3Dmd&locale=en_US)
   to see the link]_

Viewing 3 replies - 1 through 3 (of 3 total)

 *  [Elvira K.](https://wordpress.org/support/users/treibalen/)
 * (@treibalen)
 * [2 years, 7 months ago](https://wordpress.org/support/topic/error-migrator/#post-16958838)
 * Hi there [@cgcullarvega](https://wordpress.org/support/users/cgcullarvega/),
 * Thanks for reaching out and I apologize for the late reply.
 * Could you please follow the instructions to re-install the plugin via FTP and
   let me know if it works?
 * Reference: [https://kb.mailpoet.com/article/258-re-installing-updating-the-plugin-via-ftp](https://kb.mailpoet.com/article/258-re-installing-updating-the-plugin-via-ftp)
 * Don’t worry, you won’t lose any data from the plugin.
 * Let us know how it goes!
 *  Thread Starter [cgcullarvega](https://wordpress.org/support/users/cgcullarvega/)
 * (@cgcullarvega)
 * [2 years, 7 months ago](https://wordpress.org/support/topic/error-migrator/#post-16959015)
 * Hello. I have followed the instructions and still with the same error.
 * **Fatal error**: Uncaught Error: Call to undefined function MailPoet\Migrator\
   mb_strimwidth() in /var/www/recursos/wp-content/plugins/mailpoet/lib/Migrator/
   Migrator.php:90 Stack trace: #0 /var/www/recursos/wp-content/plugins/mailpoet/
   lib/Migrator/Migrator.php(38): MailPoet\Migrator\Migrator->getStatus() #1 /var/
   www/recursos/wp-content/plugins/mailpoet/lib/Config/Activator.php(78): MailPoet\
   Migrator\Migrator->run() #2 /var/www/recursos/wp-content/plugins/mailpoet/lib/
   Config/Activator.php(60): MailPoet\Config\Activator->processActivate() #3 /var/
   www/recursos/wp-content/plugins/mailpoet/lib/Config/Initializer.php(288): MailPoet\
   Config\Activator->activate() #4 /var/www/recursos/wp-includes/class-wp-hook.php(
   310): MailPoet\Config\Initializer->runActivator() #5 /var/www/recursos/wp-includes/
   class-wp-hook.php(334): WP_Hook->apply_filters() #6 /var/www/recursos/wp-includes/
   plugin.php(517): WP_Hook->do_action() #7 /var/www/recursos/wp-admin/plugins.php(
   194): do_action() #8 {main} thrown in **/var/www/recursos/wp-content/plugins/
   mailpoet/lib/Migrator/Migrator.php** on line **90**
 *  Plugin Support [Gui A. a11n](https://wordpress.org/support/users/guicmazeredo/)
 * (@guicmazeredo)
 * [2 years, 6 months ago](https://wordpress.org/support/topic/error-migrator/#post-17048938)
 * Hi there [@cgcullarvega](https://wordpress.org/support/users/cgcullarvega/) ,
 * Are you still facing this issue or has it been resolved after updating the plugin
   to the newest versions?

Viewing 3 replies - 1 through 3 (of 3 total)

The topic ‘Error Migrator’ is closed to new replies.

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## Tags

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

 * 3 replies
 * 3 participants
 * Last reply from: [Gui A. a11n](https://wordpress.org/support/users/guicmazeredo/)
 * Last activity: [2 years, 6 months ago](https://wordpress.org/support/topic/error-migrator/#post-17048938)
 * Status: not resolved