fmn-createdb: 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/fmn-createdb - from package: python-fmn-lib

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

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