nsldap.so: command not found

Have You tried accessing the binary with the full path?

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/lib/aolserver4/bin/nsldap.so - from package: aolserver4-nsldap

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