cert2spc: 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/cert2spc - from package: mono-devel

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

On Debian possible default full paths are:

/usr/bin/cert2spc - from package: mono-devel

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

Error in other languages:
cert2spc: bevel nie gevind nie
cert2spc: comandă negăsită
cert2spc: comando não encontrado
cert2spc: commande introuvable
cert2spc: command not found
cert2spc: käsku ei ole
cert2spc: không tìm thấy lệnh
cert2spc: komanda nerasta
cert2spc: Kommando nicht gefunden.
cert2spc: kommandot finns inte
cert2spc: komut yok
cert2spc: nie znaleziono polecenia
cert2spc: níor aimsíodh an t-ordú
cert2spc: no se encontró la orden
cert2spc: no s'ha trobat l'ordre
cert2spc: opdracht niet gevonden
cert2spc: parancs nem található
cert2spc: perintah tidak ditemukan
cert2spc: príkaz nenájdený
cert2spc: příkaz nenalezen
cert2spc: команда не найдена
cert2spc: командата не е открита
cert2spc: 命令找不到
cert2spc: コマンドが見つかりません