helical: 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/helical - from package: python-transmissionrpc

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

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