mono-shlib-cop: 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/mono-shlib-cop - from package: mono-devel

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

On Debian possible default full paths are:

/usr/bin/mono-shlib-cop - from package: mono-devel

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

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