gbw3: 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/gbw3 - from package: gambas3-script

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

Error in other languages:
gbw3: bevel nie gevind nie
gbw3: comandă negăsită
gbw3: comando não encontrado
gbw3: commande introuvable
gbw3: command not found
gbw3: käsku ei ole
gbw3: không tìm thấy lệnh
gbw3: komanda nerasta
gbw3: Kommando nicht gefunden.
gbw3: kommandot finns inte
gbw3: komut yok
gbw3: nie znaleziono polecenia
gbw3: níor aimsíodh an t-ordú
gbw3: no se encontró la orden
gbw3: no s'ha trobat l'ordre
gbw3: opdracht niet gevonden
gbw3: parancs nem található
gbw3: perintah tidak ditemukan
gbw3: príkaz nenájdený
gbw3: příkaz nenalezen
gbw3: команда не найдена
gbw3: командата не е открита
gbw3: 命令找不到
gbw3: コマンドが見つかりません