haproxy-systemd-wrapper: 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/sbin/haproxy-systemd-wrapper - from package: haproxy

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

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