mod_gearman_mini_epn: 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/mod_gearman_mini_epn - from package: mod-gearman-tools

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

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