circuits.web: 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/circuits.web - from package: python-circuits

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

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