Magicfilter error "lpd cannot execv <filter>"

[Jay Barbee <jybarb01@torch.adm.louisville.edu>]

I just installed Magicfilter to start printing to a local Deskjet connected
to LPT1.
I get an error off the initial install.

---Error in syslog
Sep 13 18:58:08 host kernel: lp1 at 0x0378, (polling)
Sep 13 19:18:23 host lpd[29223]: cannot execv /etc/magicfilter/djet550c-filter

---My Printcap is:
lp|djet|djet870|HP Deskjet 870:\
        :lp=/dev/lp1:sd=/var/spool/lpd/djet870:\
        :sh:pw#80:pl#66:px#1440:mx#0:\
        :if=/etc/magicfilter/djet550c-filter:\
        :af=/var/log/lp-acct:lf=/var/log/lp-errs:


Any ideas on what that error means?  Any ideas on how to fix it?  Thanks
--Jay