yapra: 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/yapra - from package: yapra

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

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