WordPress caught an error with one of your plugins, SMTP for AmazonSES – YaySMTP

I keep seeing a critical error when my site tries to send an email using this plugin. Below are the details from the email WordPress sent me. In the most recent error, I was creating a new user and it tried to send the user their details.

Since WordPress 5.2 there is a built-in feature that detects when a plugin or theme causes a fatal error on your site, and notifies you with this automated email.

In this case, WordPress caught an error with one of your plugins, SMTP for AmazonSES – YaySMTP.

First, visit your website (https://xyz.com/) and check for any visible issues. Next, visit the page where the error was caught (https://xyz.com/wp-admin/user-new.php) and check for any visible issues.

Please contact your host for assistance with investigating this issue further.

If your site appears broken and you can’t access your dashboard normally, WordPress now has a special “recovery mode”. This lets you safely login to your dashboard and investigate further.

To keep your site safe, this link will expire in 1 day. Don’t worry about that, though: a new link will be emailed to you if the error occurs again after it expires.

When seeking help with this issue, you may be asked for some of the following information:
WordPress version 6.0.1
Active theme: Divi (version 4.17.6)
Current plugin: SMTP for AmazonSES – YaySMTP (version 1.2)
PHP version 8.0.21

Error Details
=============
An error of type E_ERROR was caused in line 16 of the file /var/www/vhosts/xyz.com/httpdocs/wp-content/plugins/smtp-amazon-ses/vendor_amazon/GuzzleHttp/Promise/RejectedPromise.php. Error message: Uncaught TypeError: method_exists(): Argument #1 ($object_or_class) must be of type object|string, array given in /var/www/vhosts/xyz.com/httpdocs/wp-content/plugins/smtp-amazon-ses/vendor_amazon/GuzzleHttp/Promise/RejectedPromise.php:16
Stack trace:
#0 /var/www/vhosts/xyz.com/httpdocs/wp-content/plugins/smtp-amazon-ses/vendor_amazon/GuzzleHttp/Promise/RejectedPromise.php(16): method_exists()
#1 /var/www/vhosts/xyz.com/httpdocs/wp-content/plugins/smtp-amazon-ses/vendor_amazon/Aws/Handler/GuzzleV6/GuzzleHandler.php(39): YaySMTPAmazonSES\Aws3\GuzzleHttp\Promise\RejectedPromise->__construct()
#2 /var/www/vhosts/xyz.com/httpdocs/wp-content/plugins/smtp-amazon-ses/vendor_amazon/GuzzleHttp/Promise/Promise.php(164): YaySMTPAmazonSES\Aws3\Aws\Handler\GuzzleV6\GuzzleHandler::YaySMTPAmazonSES\Aws3\Aws\Handler\GuzzleV6\{closure}()
#3 /var/www/vhosts/xyz.com/httpdocs/wp-content/plugins/smtp-amazon-ses/vendor_amazon/GuzzleHttp/Promise/Promise.php(125): YaySMTPAmazonSES\Aws3\GuzzleHttp\Promise\Promise::callHandler()
#4 /var/www/vhosts/xyz.com/httpdocs/wp-content/plugins/smtp-amazon-ses/vendor_amazon/GuzzleHttp/Promise/TaskQueue.php(44): YaySMTPAmazonSES\Aws3\GuzzleHttp\Promise\Promise::YaySMTPAmazonSES\Aws3\GuzzleHttp\Promise\{closure}()
#5 /var/www/vhosts/xyz.com/httpdocs/wp-content/plugins/smtp-amazon-ses/vendor_amazon/GuzzleHttp/Handler/CurlMultiHandler.php(74): YaySMTPAmazonSES\Aws3\GuzzleHttp\Promise\TaskQueue->run()
#6 /var/www/vhosts/xyz.com/httpdocs/wp-content/plugins/smtp-amazon-ses/vendor_amazon/GuzzleHttp/Handler/CurlMultiHandler.php(94): YaySMTPAmazonSES\Aws3\GuzzleHttp\Handler\CurlMultiHandler->tick()
#7 /var/www/vhosts/xyz.com/httpdocs/wp-content/plugins/smtp-amazon-ses/vendor_amazon/GuzzleHttp/Promise/Promise.php(200): YaySMTPAmazonSES\Aws3\GuzzleHttp\Handler\CurlMultiHandler->execute()
#8 /var/www/vhosts/xyz.com/httpdocs/wp-content/plugins/smtp-amazon-ses/vendor_amazon/GuzzleHttp/Promise/Promise.php(183): YaySMTPAmazonSES\Aws3\GuzzleHttp\Promise\Promise->invokeWaitFn()
#9 /var/www/vhosts/xyz.com/httpdocs/wp-content/plugins/smtp-amazon-ses/vendor_amazon/GuzzleHttp/Promise/Promise.php(219): YaySMTPAmazonSES\Aws3\GuzzleHttp\Promise\Promise->waitIfPending()
#10 /var/www/vhosts/xyz.com/httpdocs/wp-content/plugins/smtp-amazon-ses/vendor_amazon/GuzzleHttp/Promise/Promise.php(185): YaySMTPAmazonSES\Aws3\GuzzleHttp\Promise\Promise->invokeWaitList()
#11 /var/www/vhosts/xyz.com/httpdocs/wp-content/plugins/smtp-amazon-ses/vendor_amazon/GuzzleHttp/Promise/Promise.php(219): YaySMTPAmazonSES\Aws3\GuzzleHttp\Promise\Promise->waitIfPending()
#12 /var/www/vhosts/xyz.com/httpdocs/wp-content/plugins/smtp-amazon-ses/vendor_amazon/GuzzleHttp/Promise/Promise.php(185): YaySMTPAmazonSES\Aws3\GuzzleHttp\Promise\Promise->invokeWaitList()
#13 /var/www/vhosts/xyz.com/httpdocs/wp-content/plugins/smtp-amazon-ses/vendor_amazon/GuzzleHttp/Promise/Promise.php(51): YaySMTPAmazonSES\Aws3\GuzzleHttp\Promise\Promise->waitIfPending()
#14 /var/www/vhosts/xyz.com/httpdocs/wp-content/plugins/smtp-amazon-ses/vendor_amazon/Aws/AwsClientTrait.php(43): YaySMTPAmazonSES\Aws3\GuzzleHttp\Promise\Promise->wait()
#15 /var/www/vhosts/xyz.com/httpdocs/wp-content/plugins/smtp-amazon-ses/vendor_amazon/Aws/AwsClientTrait.php(56): YaySMTPAmazonSES\Aws3\Aws\AwsClient->execute()
#16 /var/www/vhosts/xyz.com/httpdocs/wp-content/plugins/smtp-amazon-ses/includes/Controller/AmazonSESController.php(63): YaySMTPAmazonSES\Aws3\Aws\AwsClient->__call()
#17 /var/www/vhosts/xyz.com/httpdocs/wp-content/plugins/smtp-amazon-ses/includes/PhpMailerExtends.php(63): YaySMTPAmazonSES\Controller\AmazonSESController->send()
#18 /var/www/vhosts/xyz.com/httpdocs/wp-includes/pluggable.php(548): YaySMTPAmazonSES\PhpMailerExtends->send()
#19 /var/www/vhosts/xyz.com/httpdocs/wp-includes/pluggable.php(2211): wp_mail()
#20 /var/www/vhosts/xyz.com/httpdocs/wp-includes/user.php(3418): wp_new_user_notification()
#21 /var/www/vhosts/xyz.com/httpdocs/wp-includes/class-wp-hook.php(307): wp_send_new_user_notifications()
#22 /var/www/vhosts/xyz.com/httpdocs/wp-includes/class-wp-hook.php(331): WP_Hook->apply_filters()
#23 /var/www/vhosts/xyz.com/httpdocs/wp-includes/plugin.php(476): WP_Hook->do_action()
#24 /var/www/vhosts/xyz.com/httpdocs/wp-admin/includes/user.php(241): do_action()
#25 /var/www/vhosts/xyz.com/httpdocs/wp-admin/user-new.php(195): edit_user()
#26 {main}
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