convertConfig: 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 Debian possible default full paths are:

/usr/share/lemonldap-ng/bin/convertConfig - from package: liblemonldap-ng-common-perl

You may install the required package with command apt-get install {package}

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