Title: Uncaught TypeError Last modified: August 20, 2021 --- # Uncaught TypeError * Resolved [rverdons](https://wordpress.org/support/users/rverdons/) * (@rverdons) * [4 years, 10 months ago](https://wordpress.org/support/topic/uncaught-typeerror-52/) * Hi * I just updated to: WP-Mail-SMTP 3.0.3 Wordpress 5.8 PHP 8.0 * Now I get this error: * Fatal error: Uncaught TypeError: WPMailSMTP\Providers\MailerAbstract::__construct(): Argument #1 ($phpmailer) must be of type WPMailSMTP\MailCatcherInterface, PHPMailer\ PHPMailer\PHPMailer given, called in /www/wp-content/plugins/wp-mail-smtp/src/ Providers/Gmail/Mailer.php on line 47 and defined in /www/wp-content/plugins/ wp-mail-smtp/src/Providers/MailerAbstract.php:104 Stack trace: #0 /www/wp-content/ plugins/wp-mail-smtp/src/Providers/Gmail/Mailer.php(47): WPMailSMTP\Providers\ MailerAbstract->__construct(Object(PHPMailer\PHPMailer\PHPMailer)) #1 /www/wp- content/plugins/wp-mail-smtp/src/Providers/Loader.php(195): WPMailSMTP\Providers\ Gmail\Mailer->__construct(Object(PHPMailer\PHPMailer\PHPMailer)) #2 /www/wp-content/ plugins/wp-mail-smtp/src/Providers/Loader.php(151): WPMailSMTP\Providers\Loader- >get_entity(‘gmail’, ‘Mailer’) #3 /www/wp-content/plugins/wp-mail-smtp/src/Admin/ Review.php(106): WPMailSMTP\Providers\Loader->get_mailer(‘gmail’, Object(PHPMailer\ PHPMailer\PHPMailer)) #4 /www/wp-content/plugins/wp-mail-smtp/src/Admin/Review. php(78): WPMailSMTP\Admin\Review->review() #5 /www/wp-includes/class-wp-hook. php(303): WPMailSMTP\Admin\Review->review_request(”) #6 /www/wp-includes/class- wp-hook.php(327): WP_Hook->apply_filters(NULL, Array) #7 /www/wp-includes/plugin. php(470): WP_Hook->do_action(Array) #8 /www/wp-admin/admin-header.php(287): do_action(‘ admin_notices’) #9 /www/wp-admin/plugins.php(603): require_once(‘/www/wp-admin/ a…’) #10 {main} thrown in /www/wp-content/plugins/wp-mail-smtp/src/Providers/ MailerAbstract.php on line 104 * I disabled my plugins 1 by 1 and the error dissapears when I disable WP Mail SMTP. * Can you help me with this? Viewing 5 replies - 1 through 5 (of 5 total) * Plugin Author [Gregor Capuder](https://wordpress.org/support/users/capuderg/) * (@capuderg) * [4 years, 10 months ago](https://wordpress.org/support/topic/uncaught-typeerror-52/#post-14787996) * Hi [@rverdons](https://wordpress.org/support/users/rverdons/), * did you also update any other parts of your WP site? For example the WordPress core version? Also, which version of our plugin did you use before? * It looks like the global WordPress core `$phpmailer` variable is being overwritten by another plugin or theme. * We are expecting to get our MailCatcherV6 object instance in the `WPMailSMTP\ Providers\MailerAbstract::__construct()` method, and something else is overwriting it and providing the `PHPMailer\PHPMailer\PHPMailer` object instead. * Please check any Must-Use plugins on your WP site and/or any custom code in ` wp-config.php` file. Hosting companies usually make some overwrites, to improve or prevent the email sending via the PHPMailer class… * You already said you disabled your plugins one by one… Could you also please disable all plugins except our WP Mail SMTP? And see if this error still occurs? * If it does not, then some other plugin is causing this issue (maybe one that is also sending emails?). * Let me know how it goes. * Take care! * PS: I tested our plugin (v3.0.3 with the Gmail mailer) on PHP 8, on WP 5.8 and didn’t experience this issue. * Thread Starter [rverdons](https://wordpress.org/support/users/rverdons/) * (@rverdons) * [4 years, 10 months ago](https://wordpress.org/support/topic/uncaught-typeerror-52/#post-14789314) * Hi Gregor, Thanks for your fast response! * I also update all other plugins and my theme. I am not sure about the core version: I just updated Worpress. Is the core something separate? * I did the check you suggested: disable all plugins except WP Mail SMTP: still the same error. * I found a piece of code in my `wp-config.php` related to phpmailer. It is placed there by my hosting company (Transip). To me it doesn’t seem to replace the PHPMailer class, it just changes a setting, right? * ``` /** TransIP fix: sendmail does not support flags. This fix is needed in order to make mailing work. */ global $phpmailer; if ((!is_object( $phpmailer ) || !is_a( $phpmailer, 'PHPMailer' )) && file_exists(ABSPATH . '/wp-includes/class-phpmailer.php') && file_exists(ABSPATH . '/wp-includes/class-smtp.php')) { require_once ABSPATH . '/wp-includes/class-phpmailer.php'; require_once ABSPATH . '/wp-includes/class-smtp.php'; $phpmailer = new PHPMailer( true ); } $phpmailer->UseSendmailOptions = false; ``` * Plugin Author [Gregor Capuder](https://wordpress.org/support/users/capuderg/) * (@capuderg) * [4 years, 10 months ago](https://wordpress.org/support/topic/uncaught-typeerror-52/#post-14794233) * Hi [@rverdons](https://wordpress.org/support/users/rverdons/), * what happens, if you try to remove this block of code and save the file? Is the issue still present? * By WordPress Core I mean WordPress. So you are all good. * Did you also check the `mu-plugins` must-use plugins folder (if it exists)? And also try to switch to another theme, maybe the theme also has some custom mailing code in it. * Let me know how it goes. * Take care! * Thread Starter [rverdons](https://wordpress.org/support/users/rverdons/) * (@rverdons) * [4 years, 10 months ago](https://wordpress.org/support/topic/uncaught-typeerror-52/#post-14796749) * Hi * I tried another theme (a default WP theme): doesn’t solve the issue. The mu- plugins folder is empty. * I just disabled that piece of phpmailer code in my wp-config.php: That makes the issue go away! * So for me this issue is solved now. I’ll work with my hosting provider to see if there can be any side effects of disabling the code. Thanks for your help! * Robert * Plugin Author [Gregor Capuder](https://wordpress.org/support/users/capuderg/) * (@capuderg) * [4 years, 10 months ago](https://wordpress.org/support/topic/uncaught-typeerror-52/#post-14798177) * Hi Robert, * thanks for letting us know. I don’t think removing this code will have any side effects, because you are using our plugin to send emails. * Have a nice day! Viewing 5 replies - 1 through 5 (of 5 total) The topic ‘Uncaught TypeError’ is closed to new replies. * ![](https://ps.w.org/wp-mail-smtp/assets/icon-256x256.png?rev=1755440) * [WP Mail SMTP by WPForms - The Most Popular SMTP and Email Log Plugin](https://wordpress.org/plugins/wp-mail-smtp/) * [Frequently Asked Questions](https://wordpress.org/plugins/wp-mail-smtp/#faq) * [Support Threads](https://wordpress.org/support/plugin/wp-mail-smtp/) * [Active Topics](https://wordpress.org/support/plugin/wp-mail-smtp/active/) * [Unresolved Topics](https://wordpress.org/support/plugin/wp-mail-smtp/unresolved/) * [Reviews](https://wordpress.org/support/plugin/wp-mail-smtp/reviews/) * 5 replies * 2 participants * Last reply from: [Gregor Capuder](https://wordpress.org/support/users/capuderg/) * Last activity: [4 years, 10 months ago](https://wordpress.org/support/topic/uncaught-typeerror-52/#post-14798177) * Status: resolved