signcode: 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/signcode - from package: mono-devel

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

On Debian possible default full paths are:

/usr/bin/signcode - from package: mono-devel

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

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