make_ext4fs: 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/bin/make_ext4fs - from package: android-tools-fsutils

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

Error in other languages:
make_ext4fs: bevel nie gevind nie
make_ext4fs: comandă negăsită
make_ext4fs: comando não encontrado
make_ext4fs: commande introuvable
make_ext4fs: command not found
make_ext4fs: käsku ei ole
make_ext4fs: không tìm thấy lệnh
make_ext4fs: komanda nerasta
make_ext4fs: Kommando nicht gefunden.
make_ext4fs: kommandot finns inte
make_ext4fs: komut yok
make_ext4fs: nie znaleziono polecenia
make_ext4fs: níor aimsíodh an t-ordú
make_ext4fs: no se encontró la orden
make_ext4fs: no s'ha trobat l'ordre
make_ext4fs: opdracht niet gevonden
make_ext4fs: parancs nem található
make_ext4fs: perintah tidak ditemukan
make_ext4fs: príkaz nenájdený
make_ext4fs: příkaz nenalezen
make_ext4fs: команда не найдена
make_ext4fs: командата не е открита
make_ext4fs: 命令找不到
make_ext4fs: コマンドが見つかりません