Imagemagick and Ghostscript problem

The script we use for converting PDF files to PNG-screenshots has stopped working on some types of PDF-files. We need an Debian system admin who can fix the problems with the configuration of GhostScript in Imagemagick The server is running Debian Lenny witg Ghostscript 8.62 and Imagemagick 6.3.7 The error is as follows when using this function: "convert -density 300x300 -quality 90 -resize 566x800 [login to view URL] 18037.png" GPL Ghostscript 8.62: Unrecoverable error, exit code 1 convert: Postscript delegate failed `[login to view URL]': No such file or directory. convert: missing an image filename `[login to view URL]'. A quick solution is appreciated.