PHP Fatal error: Uncaught Google_Auth_Exception: Could not json decode the token

Hello Team,

I was wondering why I am having this fatal error.

I use your login option and I also use WP SMTP plugin for email delivery. Then I got this in my error log.

PHP Fatal error: Uncaught Google_Auth_Exception: Could not json decode the token in /home/websitename/public_html/wp-content/plugins/super-socializer/library/Google/Auth/OAuth2.php:180
Stack trace:
#0 /home/websitename/public_html/wp-content/plugins/super-socializer/library/Google/Client.php(189): Google_Auth_OAuth2->setAccessToken(NULL)
#1 /home/websitename/public_html/wp-content/plugins/wp-mail-smtp/src/Providers/Gmail/Auth.php(132): Google_Client->setAccessToken(Array)
#2 /home/websitename/public_html/wp-content/plugins/wp-mail-smtp/src/Providers/Gmail/Auth.php(46): WPMailSMTP\Providers\Gmail\Auth->get_client()
#3 /home/websitename/public_html/wp-content/plugins/wp-mail-smtp/src/Providers/Gmail/Mailer.php(78): WPMailSMTP\Providers\Gmail\Auth->__construct()
#4 /home/websitename/public_html/wp-content/plugins/wp-mail-smtp/src/MailCatcherV6.php(128): WPMailSMTP\Providers\Gmail\Mailer->send()
#5 /home/websitename/public_html/wp-includes/pluggable.php(498): WPMailSMTP\MailCatcherV6->send()
#6 /home/websitename/public_html/wp-content/plugins/woocommerce/includ in /home/websitename/public_html/wp-content/plugins/super-socializer/library/Google/Auth/OAuth2.php on line 180

Hope you can help me or give me an idea why is this happening. Thank you so much.