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Hi Support,
I have a problem with WP Mail SMTP plugin. I was using this plugin for a year, but recently I received notification from this plugin:
“Error calling POST https://www.googleapis.com//gmail/v1/users/me/messages/send: (401) Request is missing required authentication credential. Expected OAuth 2 access token, login cookie or other valid authentication credential. See https://developers.google.com/identity/sign-in/web/devconsole-project.”
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I try to reconfigure it in the last step when it required to allow access my Google Account I click “Allow” then it popup:
There has been a critical error on your website. Please check your site admin email inbox for instructions.
Learn more about debugging in WordPress.
Please help me to figured this problem.