report-gtk: 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-gtk - from package: libreport-gtk

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

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