spawn-fcgi: 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/spawn-fcgi - from package: spawn-fcgi

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

On Debian possible default full paths are:

/usr/bin/spawn-fcgi - from package: spawn-fcgi

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

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