Plugin Crashing mail functions – Cannot declare class

  • This has been happening for over 6 weeks. I figured an update would have fixed it by now, but it has not.

    2020-09-26T12:55:44+00:00 CRITICAL Cannot declare class PHPMailer\PHPMailer\SMTP, because the name is already in use in /public_html/wp-includes/PHPMailer/SMTP.php on line 30

    2020-09-26T12:58:57+00:00 CRITICAL Cannot declare class PHPMailer\PHPMailer\SMTP, because the name is already in use in /public_html/wp-includes/PHPMailer/SMTP.php on line 30

    It started when I upgraded to WP 5.5. I’ve had to keep it disabled since then, enabling it every once in a while to test. I’ve got the latest versions of all plugins on the site. I’ve got it configured with SendInBlue with a v3 api key.

Viewing 9 replies - 1 through 9 (of 9 total)
  • Thread Starter Adam Marshall

    (@ajtek)

    Debug Log when I enable the WP Mail SMTP plug-in and send a test email from it.

    Deprecated: class-phpmailer.php is deprecated since version 5.5.0! Use wp-includes/PHPMailer/PHPMailer.php instead. The PHPMailer class has been moved to wp-includes/PHPMailer subdirectory and now uses the PHPMailer\PHPMailer namespace. in /home/userfolder/public_html/wp-includes/functions.php on line 4963

    Deprecated: class-smtp.php is deprecated since version 5.5.0! Use wp-includes/PHPMailer/SMTP.php instead. The SMTP class has been moved to the wp-includes/PHPMailer subdirectory and now uses the PHPMailer\PHPMailer namespace. in /home/userfolder/public_html/wp-includes/functions.php on line 4963

    Fatal error: Cannot declare class PHPMailer\PHPMailer\SMTP, because the name is already in use in /home/userfolder/public_html/wp-includes/PHPMailer/SMTP.php on line 30
    There has been a critical error on your website. Please check your site admin email inbox for instructions.

    Learn more about debugging in WordPress.

    Hi @ajtek,

    The error message appears if your plugins or theme is not compatible with WordPress 5.5. Please share the full error log after sending a test email and share your list of activated plugins or follow this troubleshooting documentation to find out the incompatible plugin.

    Thanks.

    Hi @ajtek – We haven’t heard from you in about a week, so I’m going to go ahead and mark this ticket resolved. If you still have questions, though, please feel welcome to continue the conversation.

    Thread Starter Adam Marshall

    (@ajtek)

    Sorry, been really busy.

    The full error log is what I had already posted. If there’s a different log, please let me know where it is, or how to generate it.

    As mentioned, that’s from the debug log.

    Found another log file:

    [26-Sep-2020 12:55:43 UTC] PHP Fatal error: Cannot declare class PHPMailer\PHPMailer\SMTP, because the name is already in use in /home/userfolder/public_html/wp-includes/PHPMailer/SMTP.php on line 30

    Again, they all reference the same file.

    Thread Starter Adam Marshall

    (@ajtek)

    Active Plugins list:
    Advanced noCaptcha & invisible Captcha PRO
    AutomateWoo
    Autoptimize
    Classic Editor
    Code Snippets
    Contact Form 7
    Envato Market
    Envision Core Plugin
    EWWW Image Optimizer
    Newsletter, SMTP, Email marketing and Subscribe forms by Sendinblue
    Official Facebook Pixel
    Redirection
    Slider Revolution
    Safe SVG
    SupportCandy
    WooCommerce Stripe Gateway
    WooCommerce Google Analytics Integration
    WooCommerce Multi-currency
    WooCommerce PDF Invoices & Packing Slips
    WooCommerce Sendinblue Newsletter Subscription
    WooCommerce Subscriptions
    WooCommerce
    Wordfence Assistant
    Wordfence Security
    Yoast SEO
    WP Mail Logging
    SupportCandy – Automatic Close Ticket
    SupportCandy – Canned Reply
    SupportCandy – Email Piping
    SupportCandy – Reports
    SupportCandy – Usergroup
    SupportCandy Woocommerce Add-On

    Thread Starter Adam Marshall

    (@ajtek)

    Enabled debugging mode again, activated your plugin, then went to Settings > Send Test email

    Got this erorr:

    Deprecated: class-phpmailer.php is deprecated since version 5.5.0! Use wp-includes/PHPMailer/PHPMailer.php instead. The PHPMailer class has been moved to wp-includes/PHPMailer subdirectory and now uses the PHPMailer\PHPMailer namespace. in /home/userfolder/public_html/wp-includes/functions.php on line 4963

    Deprecated: class-smtp.php is deprecated since version 5.5.0! Use wp-includes/PHPMailer/SMTP.php instead. The SMTP class has been moved to the wp-includes/PHPMailer subdirectory and now uses the PHPMailer\PHPMailer namespace. in /home/userfolder/public_html/wp-includes/functions.php on line 4963

    Fatal error: Cannot declare class PHPMailer\PHPMailer\SMTP, because the name is already in use in /home/userfolder/public_html/wp-includes/PHPMailer/SMTP.php on line 30
    There has been a critical error on your website. Please check your site admin email inbox for instructions.

    This doesn’t really give much detail as to what is calling it, but rather that it is being called by something which looks like the main WordPress functions file.

    I’m using Envision Theme.

    Hi @ajtek,

    Thanks for the details. The potential conflict is with the “WooCommerce Sendinblue Newsletter Subscription” plugin and this option within that plugin. Please disable this option or temporarily deactivate this plugin. “Newsletter, SMTP, Email marketing and Subscribe forms by Sendinblue” might also create the conflict.

    I hope this helps!

    Thread Starter Adam Marshall

    (@ajtek)

    Disabling both:
    WooCommerce Sendinblue Newsletter Subscription
    Newsletter, SMTP, Email marketing and Subscribe forms by Sendinblue

    Allowed me to use the plugin successfully. Disabling only 1 still exhibited the same symptom, however leaving “WooCommerce Sendinblue Newsletter Subscription” active, while keeping the other deactivated, DID send the testing email before throwing the error.

    I’ve written to SendInBlue’s support team on the matter.

    Hi @ajtek – Thanks for your testing. Please note that you can only disable this option within that plugin.

    Have a good one!

Viewing 9 replies - 1 through 9 (of 9 total)
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