neopi: 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/neopi - from package: neopi

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

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