Title: Error upgrading to WP 4.0
Last modified: August 22, 2016

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# Error upgrading to WP 4.0

 *  Resolved [Timothy Wood](https://wordpress.org/support/users/codearachnid/)
 * (@codearachnid)
 * [11 years, 8 months ago](https://wordpress.org/support/topic/error-upgrading-to-wp-40/)
 * After upgrading to WordPress 4.0 the site white screened. When enabling debug
   mode I have the following errors:
 * Warning: require(api/mailjet-api-v3.php): failed to open stream: No such file
   or directory in /wp-content/plugins/mailjet-for-wordpress/wp-mailjet.php on line
   30
 * Warning: require(api/mailjet-api-v3.php): failed to open stream: No such file
   or directory in /wp-content/plugins/mailjet-for-wordpress/wp-mailjet.php on line
   30
 * Fatal error: require(): Failed opening required ‘api/mailjet-api-v3.php’ (include_path
   =’.:/usr/share/pear:/usr/share/php’) in /wp-content/plugins/mailjet-for-wordpress/
   wp-mailjet.php on line 30
 * [https://wordpress.org/plugins/mailjet-for-wordpress/](https://wordpress.org/plugins/mailjet-for-wordpress/)

Viewing 5 replies - 1 through 5 (of 5 total)

 *  [cedriclatouffe](https://wordpress.org/support/users/cedriclatouffe/)
 * (@cedriclatouffe)
 * [11 years, 8 months ago](https://wordpress.org/support/topic/error-upgrading-to-wp-40/#post-5258018)
 * I have the same problem
    [http://wordpress.org/support/topic/erreur-activation-plugin?replies=7](http://wordpress.org/support/topic/erreur-activation-plugin?replies=7)
 *  [Dave Naylor](https://wordpress.org/support/users/wpranger/)
 * (@wpranger)
 * [11 years, 8 months ago](https://wordpress.org/support/topic/error-upgrading-to-wp-40/#post-5258133)
 * I encountered a similar problem. I install most plugins via wp-cli. I found that
   wp-cli’s cached copy was versioned at 3.1.0 so that’s the file that my WordPress
   installation was installing. In fact the version here at wordpress.org and on
   Github, although identically versioned, were different.
 * Downloading from here or Github and manually installing the plugin solved the
   problem. Also, uninstalling the plugin, removing any mailjet-for-wordpress files
   from wp-cli’s cache and then installing via wp-cli pulls in the correct version.
 *  Plugin Author [Mailjet](https://wordpress.org/support/users/mailjet/)
 * (@mailjet)
 * [11 years, 7 months ago](https://wordpress.org/support/topic/error-upgrading-to-wp-40/#post-5258179)
 * Hi Dave,
    Apologies that the versions between our Github and WordPress.org were
   listed as the same. This should not have been the case. In any case, glad you
   were able to correct the problem through a workaround. We are continually updating
   the plugin so please do not hesitate to give us any feedback. Regards, Team Mailjet
 *  Plugin Author [Mailjet](https://wordpress.org/support/users/mailjet/)
 * (@mailjet)
 * [11 years, 7 months ago](https://wordpress.org/support/topic/error-upgrading-to-wp-40/#post-5258180)
 * Hi Dave,
    Apologies that the versions between our Github and WordPress.org were
   listed as the same. This should not have been the case. In any case, glad you
   were able to correct the problem through a workaround. We are continually updating
   the plugin so please do not hesitate to give us any feedback. Regards, Team Mailjet
 *  Plugin Author [Mailjet](https://wordpress.org/support/users/mailjet/)
 * (@mailjet)
 * [11 years, 7 months ago](https://wordpress.org/support/topic/error-upgrading-to-wp-40/#post-5258199)
 * Marking this as resolved with today’s update. Don’t hesitate to let us know if
   any other issues arise. Happy Mailjetting!
    Regards, Mailjet

Viewing 5 replies - 1 through 5 (of 5 total)

The topic ‘Error upgrading to WP 4.0’ is closed to new replies.

 * ![](https://ps.w.org/mailjet-for-wordpress/assets/icon.svg?rev=2994192)
 * [Mailjet Email Marketing](https://wordpress.org/plugins/mailjet-for-wordpress/)
 * [Frequently Asked Questions](https://wordpress.org/plugins/mailjet-for-wordpress/#faq)
 * [Support Threads](https://wordpress.org/support/plugin/mailjet-for-wordpress/)
 * [Active Topics](https://wordpress.org/support/plugin/mailjet-for-wordpress/active/)
 * [Unresolved Topics](https://wordpress.org/support/plugin/mailjet-for-wordpress/unresolved/)
 * [Reviews](https://wordpress.org/support/plugin/mailjet-for-wordpress/reviews/)

 * 5 replies
 * 4 participants
 * Last reply from: [Mailjet](https://wordpress.org/support/users/mailjet/)
 * Last activity: [11 years, 7 months ago](https://wordpress.org/support/topic/error-upgrading-to-wp-40/#post-5258199)
 * Status: resolved