generate.py: 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/lib/python2.7/dist-packages/vistrails/db/bin/generate.py - from package: vistrails

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

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