Acellemail campaign not getting delivered

Hello, thanks for all that you do here. Please I have installed Acellemail and all seems fine. Now when I send out campaign, I am not receiving the campaign. I added my gmail as a recipient so as to check. It is neither in the spam box or the inbox but Accellemail shows me sent.

I get this notification also when I login as admin:
[www] [2023-01-20 08:30:03 UTC+00:00] Psr\Log\InvalidArgumentException: Level “NULL” is not defined, use one of: 100, 200, 250, 300, 400, 500, 550, 600, DEBUG, INFO, NOTICE, WARNING, ERROR, CRITICAL, ALERT, EMERGENCY

Also, how can I change the footer of Acellemail as the year is still showing 2022 and now we are in 2023 + I want to remove the " © 2022. Acelle Email Marketing Application by" .

Thank you for helping