Is this a bug (converting color pdf)?

Hi, 
   I am running Ghostscript 7.05 on my Win2000 system.  I was trying
to convert a .pdf file (which happens to be in color) to a .jpg file
using this command:

D:\gs\gs7.05\bin>gswin32c -dNOPAUSE -q -sDEVICE=jpeg -dJPEGQ=90
OutputFile=Temp.jpg D:\Temp\Temp.pdf

and I get this error:

Error:  /typecheck in --get--
Operand stack:
  --nostringval--   Filter
Execution stack:
   %interp_exit   .runexec2  --nostringval--  --nostringval--  
--nostringval--   2   %stopped_push   --nostringval--  
--nostringval--   --nostringval--   false   %stopped_push   1  3  
%oparray_pop   --nostringval--  --nostringval--   --nostringval--  
--nostringval--  --nostringval--  --nostringval--  --nostringval--
Dictionary stack:
   (a bunch of stuff)

Current allocation mode is local
GNU Ghostscript 7.05:  Unrecoverable error, exit code 1


What does this error mean?  Is it me?  Is there any way to convert my
color pdf to a jpg?

Thanks, Dave A.