Sendgrid error while testing

Hello
i’ve just have configured postgrid with this tutorial
https://kinsta.com/fr/base-de-connaissances/sendgrid-wordpress/

but when i do a mail test here’s what happens

`An unexpected error occurred:

<br />
<b>Fatal error</b>: Uncaught Error: Object of class PostmanEmailAddress could not be converted to string in /www/zenmondrops_878/public/wp-content/plugins/email-log/include/Util/helper.php:171
Stack trace:
#0 /www/zenmondrops_878/public/wp-content/plugins/email-log/include/Util/helper.php(171): implode(‘,’, Array)
#1 /www/zenmondrops_878/public/wp-content/plugins/email-log/include/Core/DB/TableManager.php(401): EmailLog\Util\stringify(Array)
#2 /www/zenmondrops_878/public/wp-content/plugins/email-log/include/Core/EmailLogger.php(195): EmailLog\Core\DB\TableManager->fetch_log_id_by_data(Array)
#3 /www/zenmondrops_878/public/wp-content/plugins/email-log/include/Core/EmailLogger.php(141): EmailLog\Core\EmailLogger->mark_email_log_as_failed(Array, ‘The from addres…’)
#4 /www/zenmondrops_878/public/wp-includes/class-wp-hook.php(307): EmailLog\Core\EmailLogger->on_email_failed(Object(WP_Error))
#5 /www/zenmondrops_878/public/wp-includes/class-wp-hook.php(331): WP_Hook->apply_filters(”, Array)
#6 /www/zenmondrops_878/public/wp-inclu in <b>/www/zenmondrops_878/public/wp-content/plugins/email-log/include/Util/helper.php</b> on line <b>171</b><br />
<p>There has been a critical error on this website.</p><p><a href=”https://wordpress.org/support/article/faq-troubleshooting/”>Learn more about troubleshooting WordPress.</a></p>`

What should i do ?
Thanks