skillgui_batch_render: 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/skillgui_batch_render - from package: fawkes-guis

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

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