Error while converting image

[Todd Halter]

I am running Plucker 1.1.4 on linux and get the error

Processing file:/var/spool/netcomics/wizardofid20020315.gif.
           1 collected, 5 still to do
  Retrieved ok
No data from parsing image!
(file:/var/spool/netcomics/wizardofid20020315.gif)
Runtime error parsing document
file:/var/spool/netcomics/wizardofid20020315.gif: Error while converting
image.
  Parsing failed!

Any ideas?

Todd