Support » Plugin: Post SMTP Mailer/Email Log » PHP Fatal error: Uncaught Error: Class name must be a valid object or a string

  • Resolved miksbl


    Because we did not get any answer in the support forum ( we ask here:

    While activating “Office 365 for Post SMTP Extension” site is showing Critical error.
    Message from debug log:

    PHP Fatal error: Uncaught Error: Class name must be a valid object or a string in …./httpdocs/wp-content/plugins/post-smtp/Postman/Extensions/License/PostmanLicenseManager.php:64

    Diagnostic test:
    Mailer: postsmtp
    HostName: …
    cURL Version: 7.29.0
    OpenSSL Version: NSS/3.53.1
    OS: Linux 3.10.0 #1 SMP Fri Nov 20 21:47:55 MSK 2020 x86_64
    PHP: Linux 7.4.15 C
    PHP Dependencies: iconv=Yes, spl_autoload=Yes, openssl=Yes, sockets=Yes, allow_url_fopen=Yes, mcrypt=No, zlib_encode=Yes
    WordPress: 5.6.1 de_DE_formal UTF-8
    WordPress Theme: Fraction Theme Child
    WordPress Plugins: Gravity Forms, Time Based Content For WPBakery Page Builder ( Formerly Visual Composer ), Ultimate Addons for WPBakery Page Builder, Admin Columns Pro – WooCommerce, Admin Columns Pro, Admin Menu Editor, Advanced Custom Fields, Advisor Quiz, Ajax Search Lite, Booking Activities – Display Pack, Booking Activities – Licenses & Updates, Better Search Replace, Booking Activities, Bounce Handler Mailpoet, Broken Link Checker, CC & BCC for Woocommerce Order Emails, Classic Editor, CMS Tree Page View, Code Snippets, Simple Custom CSS and JS, Yoast Duplicate Post, Elementor Pro, Elementor, Envato Market, Fraction Extended, Gravity Forms Webhooks Add-On, GravityView Inline Edit, Head, Footer and Post Injections, Image Source Control, Imagify, WPBakery Page Builder, Kadence WooCommerce Email Designer, Language Fallback, Loco Translate, LuckyWP Table of Contents, MailPoet 3 (New), MainWP Child, Map Deutschland Bundeslaender, Max Mega Menu, MetaSlider, Post Expirator, Post SMTP, Pre-Publish Checklist, Q2W3 Fixed Widget, Redirection, Related Posts for WordPress, Search Exclude, Security Ninja (Premium), Self-Hosted Google Fonts, Shariff Wrapper, Shortcoder, Simple Author Box, WP SVG Icons MODIFIED, Swift Performance, Symple Shortcodes, Temporary Login Without Password, TI WooCommerce Wishlist, Advanced Editor Tools (previously TinyMCE Advanced), UpdraftPlus – Backup/Restore, Vendidero Helper, Widgets On Pages, PayPal PLUS for WooCommerce, Preview E-mails for WooCommerce, WooCommerce German (de_DE), Germanized for WooCommerce Pro, Germanized for WooCommerce, WooCommerce Gravity Forms Product Add-Ons, WooCommerce, Yoast SEO Premium, WP Add Custom CSS, SchedulePress Pro (Formerly Known as WP Scheduled Posts Pro), WP Scheduled Posts, WP STAGING PRO, WP YouTube Lyte, YITH WooCommerce Name Your Price, YOP Poll
    WordPress wp_mail Owner: /var/www/vhosts/….de/httpdocs/wp-content/plugins/post-smtp/Postman/PostmanWpMailBinder.php
    WordPress wp_mail Filter(s): wp_staticize_emoji_for_email, PostsmtpMailer->get_mail_args
    WordPress phpmailer_init Action(s): WC_Email_New_Order->handle_multipart, WC_Email_Cancelled_Order->handle_multipart, WC_Email_Failed_Order->handle_multipart, WC_Email_Customer_On_Hold_Order->handle_multipart, WC_Email_Customer_Processing_Order->handle_multipart, WC_Email_Customer_Completed_Order->handle_multipart, WC_Email_Customer_Refunded_Order->handle_multipart, WC_Email_Customer_Invoice->handle_multipart, WC_Email_Customer_Note->handle_multipart, WC_Email_Customer_Reset_Password->handle_multipart, WC_Email_Customer_New_Account->handle_multipart, WC_GZD_Email_Customer_Paid_For_Order->handle_multipart, WC_GZD_Email_Customer_New_Account_Activation->handle_multipart, WC_GZD_Email_Customer_Revocation->handle_multipart, WC_GZD_Email_Customer_Processing_Order->handle_multipart, WC_GZD_Email_Customer_On_Hold_Order->handle_multipart, WC_GZD_Email_Customer_SEPA_Direct_Debit_Mandate->handle_multipart, Vendidero\StoreaBill\Emails\SimpleInvoice->handle_multipart, Vendidero\StoreaBill\Emails\DocumentAdmin->handle_multipart, Vendidero\StoreaBill\Emails\CancellationInvoice->handle_multipart, Vendidero\StoreaBill\Emails\Document->handle_multipart, Vendidero\Germanized\Pro\StoreaBill\PackingSlip\Email->handle_multipart, WC_TS_Email_Customer_Trusted_Shops->handle_multipart, WC_GZD_Email_Customer_Shipment->handle_multipart, WC_GZD_Email_Customer_Return_Shipment->handle_multipart, WC_GZD_Email_Customer_Return_Shipment_Delivered->handle_multipart, WC_GZD_Email_Customer_Guest_Return_Shipment_Request->handle_multipart, WC_GZD_Email_New_Return_Shipment_Request->handle_multipart, PostsmtpMailer->phpmailer_smtp_init
    Postman: 2.0.22
    Postman Sender Domain (Envelope|Message): ….de | ….de
    Postman Prevent Message Sender Override (Email|Name): Yes | Yes
    Postman Active Transport: SMTP (smtp:tls:plain://
    Postman Active Transport Status (Ready|Connected): Yes | Yes
    Postman Deliveries (Success|Fail): 4738 | 65
    Postman TCP Timeout (Connection|Read): 30 | 120
    Postman Stealth Mode: Yes

    Please send us a solution.

    • This topic was modified 10 months, 2 weeks ago by miksbl.
Viewing 5 replies - 1 through 5 (of 5 total)
  • Same problem after activating By Yehuda Hassine
    Fatal error: Uncaught Error: Class name must be a valid object or a string in /home/danskyrk/mydomains/ Stack trace: …

    WP Version: 5.7
    Webbplatsspråk: sv_SE
    Användarspråk: sv_SE
    Startsidans URL:
    Webbplatsens URL:
    Theme Namn: Signify Education (signify-education)
    Version: 1.0.1
    Författare: WEN Themes
    Författarens webbplats:
    Överordnat tema: Signify (signify)

    Thread Starter miksbl


    Can nobody help?

    Plugin Support Tim


    Hi @miksbl,

    We cannot suppport the extensions here, sorry. It is against the forum guidelines. I will reply to any posts in the Postman SMTP forums as soon as possible. Please note that the developer and all support is voluntary, so we are not always available.

    Thanks for your patience.

    Kind Regards,

    I am getting the same issue. This is clearly a problem

    Thread Starter miksbl


    I still haven’t received any replies. You wanted to reply to the posts in the Postman SMTP forum over 2 months ago. So far nothing has happened.

Viewing 5 replies - 1 through 5 (of 5 total)
  • The topic ‘PHP Fatal error: Uncaught Error: Class name must be a valid object or a string’ is closed to new replies.