loggerhead.wsgi: 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 CentOS possible default full paths are:

/usr/bin/loggerhead.wsgi - from package: loggerhead

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/bin/loggerhead.wsgi - from package: loggerhead

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

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