[SQU] groupid

I want to install squid in RedHat 7.0
try squid -z but can not work
the below is the error messqge
can tell me how to do?

[danielc@daniel bin]$ ./squid -z
FATAL: getgrnam failed to find groupid for effective group 'nogroup'
Squid Cache (Version 2.3.STABLE4): Terminated abnormally.
CPU Usage: 0.030 seconds = 0.020 user + 0.010 sys
Maximum Resident Size: 0 KB
Page faults with physical i/o: 279

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