Squid redhat 7.3

[root@ns init.d]# squid -z FATAL: getpwnam failed to find userid for effective user 'squid' Squid Cache (Version 2.4.STABLE6): Terminated abnormally. CPU Usage: 0.010 seconds = 0.010 user + 0.000 sys Maximum Resident Size: 0 KB Page faults with physical i/o: 263 Aborted [root@ns init.d]#