Dear Team,   We are having fetal error after upgrading Wordpress 5.8. We are using both plugins Constant Contact Plugin for WordPress & Constant Contact Forms for WordPress so the issue is with Constant Contact Plugin for WordPress. Please see the below error and please try to share us the best solution as we need both of these plugins. [30-Jul-2021 13:07:34 UTC] PHP Fatal error: Uncaught TypeError: Argument 1 passed to GuzzleHttp\Client::send() must implement interface Psr\Http\Message\RequestInterface, instance of GuzzleHttp\Psr7\Response given, called in /home/omuhra/public_html/strategicaxis.ae/wp-content/plugins/constant-contact-api/vendor/constantcontact/constantcontact/src/Ctct/Services/AccountService.php on line 83 and defined in /home/omuhra/public_html/strategicaxis.ae/wp-content/plugins/constant-contact-api/vendor/guzzlehttp/guzzle/src/Client.php:101 Stack trace: #0 /home/omuhra/public_html/strategicaxis.ae/wp-content/plugins/constant-contact-api/vendor/constantcontact/constantcontact/src/Ctct/Services/AccountService.php(83): GuzzleHttp\Client->send(Object(GuzzleHttp\Psr7\Response)) #1 /home/omuhra/public_html/strategicaxis.ae/wp-content/plugins/constant-contact-forms/includes/class-api.php(124): Ctct\Services\AccountService->getAccountInfo('02bbf862-4995-4...') #2 /home/omuhra/public_html/strategicaxis.ae/wp-content/plugins/constant-contact-forms/includes/class-api.php(981 in /home/omuhra/public_html/strategicaxis.ae/wp-content/plugins/constant-contact-api/vendor/guzzlehttp/guzzle/src/Client.php on line 101   ... View more