Why does ziomon result in the following error "syntax error: operand expected (error token is "/ 1024 ")" in Red Hat Enterprise Linux 5?

Issue

Why does ziomon result in the following error "syntax error: operand expected (error token is "/ 1024 ")" in Red Hat Enterprise Linux 5?

[root@hostname ~]# /usr/sbin/ziomon -d 5 -o /tmp/test /dev/mapper/mpath0
Check devices...done 
/usr/sbin/ziomon: line 686: ((: free_space = 7% / 1024 : syntax error: operand expected (error token is "/ 1024 ") 
NOTE: No size limit specified, run without a limit. 
/usr/sbin/ziomon: line 596: [: 0: unary operator expected 
Estimated maximum disk space required for log data: approx. <1 MBytes 
Collecting configuration data...done 
Start data collection processes...done 
Collecting data...