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

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

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