pam_timestamp_check: 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:

/sbin/pam_timestamp_check - from package: pam

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

On Debian possible default full paths are:

/usr/sbin/pam_timestamp_check - from package: libpam-modules-bin

You may install the required package with command apt-get install {package}

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