crashwrite: 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/crashwrite - from package: crashmail

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

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