exec-cd: 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/sbin/exec-cd - from package: util-vserver

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