zsh4-static: 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:

/bin/zsh4-static - from package: zsh-static

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

Error in other languages:
zsh4-static: bevel nie gevind nie
zsh4-static: comandă negăsită
zsh4-static: comando não encontrado
zsh4-static: commande introuvable
zsh4-static: command not found
zsh4-static: käsku ei ole
zsh4-static: không tìm thấy lệnh
zsh4-static: komanda nerasta
zsh4-static: Kommando nicht gefunden.
zsh4-static: kommandot finns inte
zsh4-static: komut yok
zsh4-static: nie znaleziono polecenia
zsh4-static: níor aimsíodh an t-ordú
zsh4-static: no se encontró la orden
zsh4-static: no s'ha trobat l'ordre
zsh4-static: opdracht niet gevonden
zsh4-static: parancs nem található
zsh4-static: perintah tidak ditemukan
zsh4-static: príkaz nenájdený
zsh4-static: příkaz nenalezen
zsh4-static: команда не найдена
zsh4-static: командата не е открита
zsh4-static: 命令找不到
zsh4-static: コマンドが見つかりません