forge_set_password: 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/forge_set_password - from package: gforge-db-postgresql
/usr/share/gforge/bin/forge_set_password - from package: gforge-db-postgresql

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

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