PHP Fatal error: Uncaught Error: Class name must be a valid object or a string

[Maik Siebel]

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 /var/www/vhosts/eventfaq.de/httpdocs/wp-content/plugins/post-smtp/Postman/Extensions/License/PostmanLicenseManager.php:64

Diagnostic test:
Mailer: postsmtp
HostName: eventfaq.de
cURL Version: 7.29.0
OpenSSL Version: NSS/3.53.1
OS: Linux srv17.level2.blog 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/eventfaq.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): eventfaq.de | eventfaq.de
Postman Prevent Message Sender Override (Email|Name): Yes | Yes
Postman Active Transport: SMTP (smtp:tls:plain://email-smtp.eu-central-1.amazonaws.com:587)
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.

[Maik Siebel]

It is a great pity that you do not provide support here. We would even be willing to pay for a working solution.

[SJ]

@miksbl Did you find a solution? Almost one month later and no response?

I am guessing another plugin is required – did you find anything that works with O365

[Maik Siebel]

Still no answer and no solution…..

[Maik Siebel]

I need still an answer. Also other users have the same issue (see comment from user SJW): https://wordpress.org/support/topic/php-fatal-error-uncaught-error-class-name-must-be-a-valid-object-or-a-string/

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