hl-kate-convert: 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/hl-kate-convert - from package: libsyntax-highlight-engine-kate-perl

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

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