pbo-read-argb8888: 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/lib64/piglit/bin/pbo-read-argb8888 - from package: piglit

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

Error in other languages:
pbo-read-argb8888: bevel nie gevind nie
pbo-read-argb8888: comandă negăsită
pbo-read-argb8888: comando não encontrado
pbo-read-argb8888: commande introuvable
pbo-read-argb8888: command not found
pbo-read-argb8888: käsku ei ole
pbo-read-argb8888: không tìm thấy lệnh
pbo-read-argb8888: komanda nerasta
pbo-read-argb8888: Kommando nicht gefunden.
pbo-read-argb8888: kommandot finns inte
pbo-read-argb8888: komut yok
pbo-read-argb8888: nie znaleziono polecenia
pbo-read-argb8888: níor aimsíodh an t-ordú
pbo-read-argb8888: no se encontró la orden
pbo-read-argb8888: no s'ha trobat l'ordre
pbo-read-argb8888: opdracht niet gevonden
pbo-read-argb8888: parancs nem található
pbo-read-argb8888: perintah tidak ditemukan
pbo-read-argb8888: príkaz nenájdený
pbo-read-argb8888: příkaz nenalezen
pbo-read-argb8888: команда не найдена
pbo-read-argb8888: командата не е открита
pbo-read-argb8888: 命令找不到
pbo-read-argb8888: コマンドが見つかりません