MSProject.pm: 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/ace/bin/PerlACE/MSProject.pm - from package: mpc-ace

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

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