amavisd.service failed to start

I followed this guide:
https://www.howtoforge.com/perfect-...3#-install-amavisdnew-spamassassin-and-clamav
on a Centos 7.4 server.
Mail can't be received. Amavisd.service fails to start

Code:

amavisd.service - Amavisd-new is an interface between MTA and content checkers.
   Loaded: loaded (/usr/lib/systemd/system/amavisd.service; enabled; vendor preset: disabled)
   Active: failed (Result: start-limit) since Sun 2018-01-14 13:51:31 EST; 11s ago
     Docs: http://www.ijs.si/software/amavisd/#doc
  Process: 27218 ExecStart=/usr/sbin/amavisd -c /etc/amavisd/amavisd.conf (code=exited, status=13)

Jan 14 13:51:31 host.xxxxx.net systemd[1]: Failed to start Amavisd-new is an interface between MTA and content checkers..
Jan 14 13:51:31 host.xxxxx.net systemd[1]: Unit amavisd.service entered failed state.
Jan 14 13:51:31 host.xxxxx.net systemd[1]: amavisd.service failed.
Jan 14 13:51:31 host.xxxxx.net systemd[1]: amavisd.service holdoff time over, scheduling restart.
Jan 14 13:51:31 host.xxxxx.net systemd[1]: start request repeated too quickly for amavisd.service
Jan 14 13:51:31 host.xxxxx.net systemd[1]: Failed to start Amavisd-new is an interface between MTA and content checkers..
Jan 14 13:51:31 host.xxxxx.net systemd[1]: Unit amavisd.service entered failed state.
Jan 14 13:51:31 host.xxxxx.net systemd[1]: amavisd.service failed.

 

This 'cat /var/log/maillog | grep 'amavisd'' gave me this:

Code:

Jan 15 00:51:38 host amavis[2906]: (02906-01) (!)connect to /var/run/clamd.amavisd/clamd.sock failed, attempt #1: Can't connect to a UNIX socket /var/run/clamd.amavisd/clamd.sock: No such file or directory                                                                      
Jan 15 00:51:38 host amavis[2905]: (02905-01) (!)connect to /var/run/clamd.amavisd/clamd.sock failed, attempt #1: Can't connect to a UNIX socket /var/run/clamd.amavisd/clamd.sock: No such file or directory                                                                      
Jan 15 00:51:39 host amavis[2905]: (02905-01) (!)connect to /var/run/clamd.amavisd/clamd.sock failed, attempt #1: Can't connect to a UNIX socket /var/run/clamd.amavisd/clamd.sock: No such file or directory                                                                      
Jan 15 00:51:39 host amavis[2906]: (02906-01) (!)connect to /var/run/clamd.amavisd/clamd.sock failed, attempt #1: Can't connect to a UNIX socket /var/run/clamd.amavisd/clamd.sock: No such file or directory                                                                      
Jan 15 00:51:39 host amavis[2905]: (02905-01) (!)ClamAV-clamd: All attempts (1) failed connecting to /var/run/clamd.amavisd/clamd.sock, retrying (2)
Jan 15 00:51:39 host amavis[2906]: (02906-01) (!)ClamAV-clamd: All attempts (1) failed connecting to /var/run/clamd.amavisd/clamd.sock, retrying (2)
Jan 15 00:51:45 host amavis[2905]: (02905-01) (!)connect to /var/run/clamd.amavisd/clamd.sock failed, attempt #1: Can't connect to a UNIX socket /var/run/clamd.amavisd/clamd.sock: No such file or directory                                                                      
Jan 15 00:51:45 host amavis[2906]: (02906-01) (!)connect to /var/run/clamd.amavisd/clamd.sock failed, attempt #1: Can't connect to a UNIX socket /var/run/clamd.amavisd/clamd.sock: No such file or directory                                                                      
Jan 15 00:51:45 host amavis[2906]: (02906-01) (!)ClamAV-clamd av-scanner FAILED: run_av error: Too many retries to talk to /var/run/clamd.amavisd/clamd.sock (All attempts (1) failed connecting to /var/run/clamd.amavisd/clamd.sock) at (eval 134) line 659.\n                   
Jan 15 00:51:45 host amavis[2905]: (02905-01) (!)ClamAV-clamd av-scanner FAILED: run_av error: Too many retries to talk to /var/run/clamd.amavisd/clamd.sock (All attempts (1) failed connecting to /var/run/clamd.amavisd/clamd.sock) at (eval 134) line 659.\n 

I can confirm the file is there and it exists. I don't understand why it can't find it. If I run Amavisd as root it works just fine.