question concerning pass and exec

I am running a Redhat Enterprise based system with the distro detfault
implementation of net-snmp-5.1.2. I have modified the snmpd.conf so as to be
able to remotely poll the server for information, which is working
wonderfully.

My problem is that I have added a number of exec and pass directives to
snmpd.conf that don't seem to be working. I constantly get nosuch name erros
on the remote end when running snmpget and snmpwalks. For the scripts/apps
that I have in the pass and exec statements, do they need to be in specific
places on the file system and with specific permissions?

pass .1.3.6.1.4.100.2 /usr/bin/perl /opt/watchmaillog/readcounters.pl spam
pass .1.3.6.1.4.100.4 /usr/bin/perl /opt/watchmaillog/readcounters.pl virus
pass .1.3.6.1.4.100.5 /usr/bin/perl /opt/watchmaillog/readcounters.pl
mess_recv
pass .1.3.6.1.4.100.6 /usr/bin/perl /opt/watchmaillog/readcounters.pl
mess_sent
pass .1.3.6.1.4.100.7 /usr/bin/perl /opt/watchmaillog/readcounters.pl
mess_relay
pass .1.3.6.1.4.100.8 /usr/bin/perl /opt/watchmaillog/readcounters.pl
mess_waiting
pass .1.3.6.1.4.100.9 /usr/bin/perl /opt/watchmaillog/readcounters.pl
mess_rejected

As noted above, I am trying to pass the results of "readcounters.pl" (which
has a command arguement.) Is there something not correct here? The script "
readcounters.pl" is set to ugo+rx

The snmpd log on the system shows that I am requesting the OIDs, but nothing
more. I do have 3 errors in the snmpd conf file:

/etc/snmp/snmpd.conf: line 99: Error: bad prefix match parameter "0", should
be: exact or prefix - installing anyway
/etc/snmp/snmpd.conf: line 100: Error: bad prefix match parameter "0",
should be: exact or prefix - installing anyway
/etc/snmp/snmpd.conf: line 101: Error: bad prefix match parameter "0",
should be: exact or prefix - installing anyway

But these entries are related to the following lines in the config file,
which may or not be related to my problem:

##                context sec.model sec.level prefix read   write  notif
access MyROGroup ""      any       noauth    0      all    none   none
access MyROGroup2 ""      any       noauth    0      all    none   none
access MyROGroup3 ""      any       noauth    0      all    none   none

Am I not setting up the snmpd daemon correctly?

I am not seeing any sign that snmpd is even running the "readcounters.pl"
script, and I am able to run the script manually and get the data I expect.

I am having this same general problem with mrtg-mailstats:

exec .1.3.6.1.4.100.10 msgsTOTAL /usr/bin/mrtg-mailstats -S total
exec .1.3.6.1.4.100.11 msgsFROM /usr/bin/mrtg-mailstats -S from
exec .1.3.6.1.4.100.12 msgsTO /usr/bin/mrtg-mailstats -S to
exec .1.3.6.1.4.100.13 msgsREJ /usr/bin/mrtg-mailstats -S rej

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