check_callstack: 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/check_callstack - from package: mpich2

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

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