Error after update

Same here after updating to the latest 5.2.2 Plugin release from the last Plugin update.

[28-Jul-2020 21:56:28 UTC] PHP Warning: require_once([…]/wp-includes/PHPMailer/PHPMailer.php): failed to open stream: No such file or directory in […]/wp-content/plugins/mailjet-for-wordpress/src/includes/MailjetMail.php on line 26
[28-Jul-2020 21:56:28 UTC] PHP Fatal error: require_once(): Failed opening required ‘[…]/wp-includes/PHPMailer/PHPMailer.php’ (include_path=’.:/opt/bitnami/php/lib/php’) in […]/wp-content/plugins/mailjet-for-wordpress/src/includes/MailjetMail.php on line 26

Auto-updating of the plugin leads to the fatal error.
(needs the plugin folder to be deleted to re-access wp-admin and site)

Re-installing the plugin leads to the fatal error and doesn’t let the plugin get activated.

To fix the problem quickly you will have to update two lines in
wp-content/plugins/mailjet-for-wordpress/src/includes/MailjetMail.php line 26 and 27 :

require_once ABSPATH . WPINC . '/class-phpmailer.php';
require_once ABSPATH . WPINC . '/class-smtp.php';

PHPMailer classes are in the root of wp-includes/ folder in WP 5.4.2, but futur version of WordPress will update PHPMailer to a newer version and it will be in wp-includes/PHPMailer/. Seems like the update of this plugin have been done before the new release of WordPress.

• This reply was modified 4 years, 3 months ago by prometee. Reason: format
• This reply was modified 4 years, 3 months ago by prometee.
• This reply was modified 4 years, 3 months ago by prometee.

Same problem. The PHPMailer.php file is not at the place the plugin is looking for it, which causes a fatal error and makes the website crash completely.
I reverted to the version 5.2.1 from a backup. That fixed the problem by the time the editor publishes a new debugged release.

Thanks @prometee it works like a charm !
Just need to wait for the plugin fix.

@mailjet this Plugin needs an urgent Plugin update to restore it on w.org

Hello,
Sorry for the inconvenience, a new version has been pushed and should fix the issue. You will be able to get it as soon as the plugin will be reactivated.
We are currently working on a version that will be compatible with WordPress 5.5 and previous versions. The release will be available in the next few days.

@mailjet , only 5.2.2 is available from github … https://github.com/mailjet/wordpress-mailjet-plugin-apiv3/releases
I suggest you post your fix there “now” …

Hey everyone,

The plugin is back online: https://www.ads-software.com/plugins/mailjet-for-wordpress/.

Thanks again for your patience and we apologize for the inconvenience.

Cheers ??