Hi,
I wanted to jump on and say that I have the exact problem as described above with my Gmail mailer. When sending a test email I get this message.
“There was a critical error on your website. Please check your site administrator email inbox for instructions”
And this message appears at the top of my dashboard:
“There was a problem while retrieving Auth for gmail: Could not json decode the token”
The plugin worked great for years up until a couple of weeks ago. I also tried recreating the Google API credentials a few times.
Plugin Version: v2.1.1
WP Version: 5.4.2
PHP Version: 5.6
Well, this is embarrassing. The problem was my layout settings. By default I am set to full-width-content, so I needed to change the layout to sidebar-content within the page settings. Somehow that step was erased from my memory over the last few weeks.
Cheers!
