osgcallback: 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/osgcallback - from package: openscenegraph

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

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