HTMLDOC Problem:

Htmldoc produced no pdf-output.
Commandline:
/usr/local/bin/htmldoc -t pdf13  --webpage -f /srv/www/vhosts/hit-enter/hosts/lastminute-nordsee-reisen.de/typo3temp/hd_mH45bw - 2>/srv/www/vhosts/hit-enter/hosts/lastminute-nordsee-reisen.de/typo3temp/se_Of6cVg

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.
/usr/local/bin/htmldoc: not found