ProjectCenter: 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/ProjectCenter - from package: projectcenter.app

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

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