NiSimpleCreate: 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 CentOS possible default full paths are:

/usr/bin/NiSimpleCreate - from package: openni-examples

You may install the required package with command yum install {package}

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