bpchat: 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/bpchat - from package: ion

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

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