Mailman error after mdbox upgrade

I upgraded my server to mdbox and now mailman is failing over and over.

The error is:90

Code:

Waiting for “mailman” to start ……Job for mailman.service failed because a configured resource limit was exceeded. See "systemctl status mailman.service" and "journalctl -xe" for details. …Waiting for mailman,qrunner to shutdown ... not running. Job for mailman.service failed because a configured resource limit was exceeded. See "systemctl status mailman.service" and "journalctl -xe" for details. …failed.

Cpanel::Exception::Services::StartError Service Error
(XID 453urg) The “mailman” service failed to start.

Startup Log
Jul 03 16:26:24 dwhslvxx.example.net restartsrv_mailman[28357]: process on some other host may have acquired it. We can't test for stale
Jul 03 16:26:24 dwhslvxx.example.net restartsrv_mailman[28357]: locks across host boundaries, so you'll have to do this manually. Or, if you
Jul 03 16:26:24 dwhslvxx.example.net restartsrv_mailman[28357]: know the lock is stale, re-run mailmanctl with the -s flag.
Jul 03 16:26:24 dwhslvxx.example.net restartsrv_mailman[28357]: Lock file: /usr/local/cpanel/3rdparty/mailman/locks/master-qrunner
Jul 03 16:26:24 dwhslvxx.example.net restartsrv_mailman[28357]: Lock host: lvxx.example.pro
Jul 03 16:26:24 dwhslvxx.example.net restartsrv_mailman[28357]: Exiting.
Jul 03 16:26:24 dwhslvxx.example.net systemd[1]: PID file /usr/local/cpanel/3rdparty/mailman/data/master-qrunner.pid not readable (yet?) after start.
Jul 03 16:26:24 dwhslvxx.example.net systemd[1]: Failed to start mailman services.
Jul 03 16:26:24 dwhslvxx.example.net systemd[1]: Unit mailman.service entered failed state.
Jul 03 16:26:24 dwhslvxx.example.net systemd[1]: mailman.service failed.

mailman has failed. Contact your system administrator if the service does not automagically recover.