qs_eval: 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/bin/qs_eval - from package: qtscript-tools

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

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