arb_debug_output-api_error: 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/arb_debug_output-api_error - from package: piglit

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

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