htmldoc problem

HTMLDOC Problem:

Htmldoc produced no pdf-output.
Commandline:

/usr/bin/htmldoc --browserwidth 800 -t pdf13  --webpage -f /var/www/web6/html/typo3temp/hd_D525h2 - 2>/var/www/web6/html/typo3temp/se_f6RxXy

This is the (stderr) output of the htmldoc command without the htmldoc_append parameters:
If you see no errors here please check your htmldoc_append parameters too.

sh: /usr/bin/htmldoc: No such file or directory