Error when trying to register with reCAPTCHA

Dear Support,

I just purchased the GD reCAPTCHA Add-on and when I activate it and try it with a test user on my registration page it gives me this error (it still creates the user though):

Fatal error: Uncaught exception ‘Google_Auth_Exception’ with message ‘Error refreshing the OAuth2 token, message: ‘{ “error” : “invalid_grant” }” in /home/cecfri/yourhotelmarket.com/wp-content/plugins/gmail-smtp/google-api-php-client/src/Google/Auth/OAuth2.php:363 Stack trace: #0 /home/cecfri/yourhotelmarket.com/wp-content/plugins/gmail-smtp/google-api-php-client/src/Google/Auth/OAuth2.php(278): Google_Auth_OAuth2->refreshTokenRequest(Array) #1 /home/cecfri/yourhotelmarket.com/wp-content/plugins/gmail-smtp/google-api-php-client/src/Google/Client.php(457): Google_Auth_OAuth2->refreshToken(‘1/7Ac1ziCuX-526…’) #2 /home/cecfri/yourhotelmarket.com/wp-content/plugins/gmail-smtp/class.phpmaileroauthgoogle.php(142): Google_Client->refreshToken(‘1/7Ac1ziCuX-526…’) #3 /home/cecfri/yourhotelmarket.com/wp-content/plugins/gmail-smtp/PHPMailer/class.smtp.php(471): GmailXOAuth2->getOauth64() #4 /home/cecfri/yourhotelmarket.com/wp-content/plugins/gmail-smtp/class.phpmaileroauth.php(153): SMTP->authenticate(”, ”, ‘XOAUTH2’, ”, ‘ in /home/cecfri/yourhotelmarket.com/wp-content/plugins/gmail-smtp/google-api-php-client/src/Google/Auth/OAuth2.php on line 363

Right now I deactivated the plugin, but when you have to time to check it out, let me know and I can turn it on again.

Thanks,
Cecilia