bf-level-editor: 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/bf-level-editor - from package: plee-the-bear

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

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