few things:

– you are using a version of wppizza (2.16.11.28) that is about a year and a half old.
assuming your site worked a year and a half ago and i have not changed anything in that version since , you shoudl find out what changed elsewhere

– i generally really cannot offer support for old software versions (there’s a reason why plugins get updated)

– that said, your error log says things like this

ERROR PostmanGoogleAuthenticationManager: invalid_grant processing response: Token has been expired or revoked.
ERROR PostmanWpMail: Exception code=0 message=Token has been expired or revoked.(invalid_grant)
PHP Notice:  Undefined index: phpmailer in /home1/dankdash/public_html/wp-content/plugins/wppizza/classes/wppizza.send-emails.inc.php on line 965
PHP Notice:  Trying to get property of non-object in /home1/dankdash/public_html/wp-content/plugins/wppizza/classes/wppizza.send-emails.inc.php on line 965

which would make me think your Postman plugin throws errors (as the Undefined index: phpmailer notice in the wppizza plugin refers to emails and the way wordpress sends emails)

i’d suggest you turn of that plugin (or indeed check your settings there, as it might also not be the Postman’s plugin fault but simply the settings entered there) and see what happens
(i’d also suggest this link https://perishablepress.com/how-to-troubleshoot-wordpress/)