afp_client: 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/afp_client - from package: fuse-afp

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

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