Snapshot Pro won't run

Snapshot Pro will not execute either manually or through managed backups.
I have disabled all plugins, deleted and reinstalled Snapshot Pro and it still will not execute - doesn't run at all - get following error message: "AAA An unknown response returned from Snapshot backup attempt. Aborting. Double check Snapshot settings."
Website just "runs" - have to go into cpanel - delete Snapshot Pro
Have also switched themes to WP 2017 as well WP 2015 - with all plugins deactivated. Still won't run.
Have cleared cache - have flushed DNS.
Still not working