ApbsClient.py: 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/ApbsClient.py - from package: apbs

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

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