imagemagick with pdf

[Roger Pack]

Does anybody get the following failure with using imagemagick on pdf's?

(install ghostscript first)

$ convert Children.pdf[0] yo.jpg

convert: unable to load module
`/opt/rdp_project_local/lib/ImageMagick-6.8.0/modules-Q16/coders/pdf.la':
file not found @ error/module.c/OpenModule/1278.
convert: no decode delegate for this image format `Children.pdf' @
error/constitute.c/ReadImage/550.


Thanks.