dovecot.service failed

hi,

dovecot.service failed!

[root@cloud ~]# service dovecot start
Redirecting to /bin/systemctl start dovecot.service

** (pkttyagent:10402): WARNING **: 14:48:24.431: Unable to register authentication agent: GDBus.Error:org.freedesktop.PolicyKit1.Error.Failed: Cannot determine user of subject
Error registering authentication agent: GDBus.Error:org.freedesktop.PolicyKit1.Error.Failed: Cannot determine user of subject (polkit-error-quark, 0)
Job for dovecot.service failed because the control process exited with error code. See "systemctl status dovecot.service" and "journalctl -xe" for details.

hi can you disable secure processes from admin >> security and check ?