on commit, no such function error

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When I try to use "on commit" the get the following error in the DHCP Server
log:

Jan 23 14:48:38 devgate dhcpd: execute: no such function.
Jan 23 14:48:38 devgate dhcpd: executed callout10.100.30.56

Here is an excerpt from my dhcpd.conf file:

subnet 172.29.17.0 netmask 255.255.255.0
{
 range 172.29.17.10 172.29.17.20;
}

subnet 10.100.30.0 netmask 255.255.255.0
{
 range 10.100.30.56 10.100.30.56;
}

on commit {
 set client=binary-to-ascii (10,8,".",leased-address);
 set program="/dhcpcallout";
 log (concat("program to execute:",program));
 execute (program,"--message",client);
 log (concat("executed callout",client));
}

The program, dhcpcallout, is a simple shell script that echo's some text
into another file when executed.  I have been searching all over the place
for information on the use of this feature to try and figure out why I am
receiving the error above.  Assistance would be greatly appreciated.  Also,
can anyone point me to more detailed documentation pertaining to "on commit,
on release, on expiry, and execute"?

Thanks,

============================================
John Jason Brzozowski
jjmb@xxxxxxxx
============================================


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