Error when sending test email

Replies: 1

It was working fine yesterday and today I’m getting errors.

Versions:
WordPress: 4.9.5
WordPress MS: No
PHP: 5.6.35
WP Mail SMTP: 1.2.5

Params:
Mailer: gmail
Constants: No

Debug:
There was a problem while retrieving Mailer for gmail: Could not json decode the token
There was a problem while retrieving Mailer for gmail: Could not json decode the token