mono-api-check: 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-api-check - from package: mono-devel

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

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