mono-find-requires: 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 Debian possible default full paths are:

/usr/bin/mono-find-requires - from package: mono-utils

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

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