EMails not being sent out

Your software
My Mautic version is:2.6
My PHP version is: 7.2

Your problem
My problem is: EMails are not being sent out

These errors are showing in the log: ??

If I send an email when I click on the contact, the email goes out but in the campaign, nothing happens.

I created a campaign like this in the picture below. WHen he submits the form he should be added to segment. ANd based on dropdown field selection he should get specific email. But that does not happen based on history of the contact.

Click on pic below

also cron emails say the following

Rebuilding contacts for segment 1
0 total contact(s) to be added in batches of 300
0 total contact(s) to be removed in batches of 300
0 contact(s) affected

Rebuilding contacts for segment 3
0 total contact(s) to be added in batches of 300
0 total contact(s) to be removed in batches of 300
0 contact(s) affected

Rebuilding contacts for segment 5
0 total contact(s) to be added in batches of 300
0 total contact(s) to be removed in batches of 300
0 contact(s) affected

Rebuilding contacts for segment 2
0 total contact(s) to be added in batches of 300
0 total contact(s) to be removed in batches of 300
0 contact(s) affected

Rebuilding contacts for campaign 1
0 total contact(s) to be added in batches of 300
0 total contact(s) to be removed in batches of 300

No mailboxes are configured.

Webhook Bundle is in immediate process mode. To use the command function change to command mode.

I would make sure you did your cornjobs correctly. I mistakenly did mine wrong on a new install and that was what was causing mine not to work.