abrt-action-notify: 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/abrt-action-notify - from package: abrt

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

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