velvetg_63: 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/velvetg_63 - from package: velvet-long

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

Error in other languages:
velvetg_63: bevel nie gevind nie
velvetg_63: comandă negăsită
velvetg_63: comando não encontrado
velvetg_63: commande introuvable
velvetg_63: command not found
velvetg_63: käsku ei ole
velvetg_63: không tìm thấy lệnh
velvetg_63: komanda nerasta
velvetg_63: Kommando nicht gefunden.
velvetg_63: kommandot finns inte
velvetg_63: komut yok
velvetg_63: nie znaleziono polecenia
velvetg_63: níor aimsíodh an t-ordú
velvetg_63: no se encontró la orden
velvetg_63: no s'ha trobat l'ordre
velvetg_63: opdracht niet gevonden
velvetg_63: parancs nem található
velvetg_63: perintah tidak ditemukan
velvetg_63: príkaz nenájdený
velvetg_63: příkaz nenalezen
velvetg_63: команда не найдена
velvetg_63: командата не е открита
velvetg_63: 命令找不到
velvetg_63: コマンドが見つかりません