hlhtml.pl: command not found

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On Debian possible default full paths are:

/usr/share/doc/libsyntax-highlight-engine-kate-perl/examples/bin/hlhtml.pl - from package: libsyntax-highlight-engine-kate-perl

You may install the required package with command apt-get install {package}

Error in other languages:
hlhtml.pl: bevel nie gevind nie
hlhtml.pl: comandă negăsită
hlhtml.pl: comando não encontrado
hlhtml.pl: commande introuvable
hlhtml.pl: command not found
hlhtml.pl: käsku ei ole
hlhtml.pl: không tìm thấy lệnh
hlhtml.pl: komanda nerasta
hlhtml.pl: Kommando nicht gefunden.
hlhtml.pl: kommandot finns inte
hlhtml.pl: komut yok
hlhtml.pl: nie znaleziono polecenia
hlhtml.pl: níor aimsíodh an t-ordú
hlhtml.pl: no se encontró la orden
hlhtml.pl: no s'ha trobat l'ordre
hlhtml.pl: opdracht niet gevonden
hlhtml.pl: parancs nem található
hlhtml.pl: perintah tidak ditemukan
hlhtml.pl: príkaz nenájdený
hlhtml.pl: příkaz nenalezen
hlhtml.pl: команда не найдена
hlhtml.pl: командата не е открита
hlhtml.pl: 命令找不到
hlhtml.pl: コマンドが見つかりません