fusedav: command not found

Have You tried accessing the binary with the full path?

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/fusedav - from package: fusedav

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