[Pound Mailing List] pound won't start

Hello,

i am on CentOS 7, i just installed pound via yum.
Everytime i want to start it this error comes up.

May 19 01:23:17 localhost systemd: PID file /var/run/pound.pid not readable
(yet?) after start.
May 19 01:24:47 localhost systemd: pound.service operation timed out.
Terminating.
May 19 01:24:47 localhost systemd: Failed to start Pound Reverse Proxy And
Load-balancer.
May 19 01:24:47 localhost systemd: Unit pound.service entered failed state.

And this is my config :

User            "nginx"
Group           "nginx"
LogLevel        1
Alive           30
Control "/tmp/poundctl.socket"

ListenHTTP
    Address  0.0.0.0
    Port     80

    Service
         BackEnd
            Address 127.0.0.1
            Port    8080
        End
    End
End

ListenHTTPS
    HeadRemove "X-Forwarded-Proto"
    AddHeader  "X-Forwarded-Proto: https"
    Address    0.0.0.0
    Port       443
    Cert       "/etc/pki/tls/certs/mycert.pem"

    Service
        BackEnd
            Address 127.0.0.1
            Port    8080
        End
    End
End


Does anyone has a clue?

thanks,

Daniel