report-newt: 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/report-newt - from package: libreport-newt

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

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