DllPlugInTester: 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/DllPlugInTester - from package: cppunit

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

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